Not again...FI Problems (Mira Re-Post)

Discussion in '1.0 Mirror' started by User1, Feb 19, 2009.

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  1. User1

    User1 RETIRED Admin, pm OFF Staff Member

    Location:
    Seattle
    <TABLE cellSpacing=1 cellPadding=6 width="100%" border=0><TBODY><TR><TD colSpan=2><TABLE width="100%" border=0><TBODY><TR><TD style="PADDING-TOP: 4px" vAlign=top colSpan=2>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]Not again...FI Problems (Mira Re-Post)<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 20 2000 at 1:06 PM[FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<SCRIPT language=Javascript> <!-- var n54_em; n54_em = ""; n54_em = n54_em + "a";n54_em = n54_em + "d";n54_em = n54_em + "m";n54_em = n54_em + "i";n54_em = n54_em + "n";n54_em = n54_em + "@";n54_em = n54_em + "s";n54_em = n54_em + "s";n54_em = n54_em + "-";n54_em = n54_em + "e";n54_em = n54_em + ".";n54_em = n54_em + "c";n54_em = n54_em + "o";n54_em = n54_em + "m"; document.write("Deven Morgan"); // --> </SCRIPT>Deven Morgan <NOSCRIPT></NOSCRIPT> [/FONT]</TD></TR><TR><TD vAlign=bottom colSpan=3><HR></TD></TR><TR><TD colSpan=3>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Well, after enjoying the sounds of an un-muffled PBS header for as long as possible (18 Hours), I went ahead and put the Stupertrapp exhaust on. While testing my fittings for the exhaust, I came around a corner, holding at about 4000, ready to drop into 3rd. All of the sudden, all the power went out. The engine was still running, but any throttle modulation had no effect at all. After coasting to a stop, the car required full throttle just to hold idle. After getting the car dragged back to the lab, we took off the air filter to check and make sure that the enging was getting air, and it was. Additionally, I checked all of the ignition components that I have recently replaced and everything appears fine.

    While we had the air box off, I got the car started again, and the header and exhaust got hot enough that they were glowing red! I have to assume that this is not normal, and that the car is running way richer than it should, and am hoping that this may be indicative to someone out there the nature of the problem that is preventing me from running. Anyone have any ideas what systems to check now? I have to conclude that the ignition in not the culprit, so mow I've moved on to fuel injection system being the problem. Is there something obvious that I'm missing, or something simple that I could check? Problem sound familiar? As always, and often, thanks everyone in advance.

    Feeling like an Idiot

    Deven Morgan
    1981 FI (sometimes) X1/9<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top noWrap align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]Author[/FONT]</TD><TD>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]Reply[/FONT]</TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]Julian[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 15px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->(silly) question<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 20 2000, 1:52 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 15px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Correct me if I'm wrong, but if the engine was running RICH shouldn't the running temperature drop, not go up. I'm sure it a lean mixture that causes this sort of overheating over the exhaust.

    If I'm right then it could be fuel pressure that is the problem, not the ignition.

    If I'm wrong someone will come along and tell me how stupid I'm being!<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<SCRIPT language=Javascript> <!-- var n54_em; n54_em = ""; n54_em = n54_em + "s";n54_em = n54_em + "t";n54_em = n54_em + "e";n54_em = n54_em + "v";n54_em = n54_em + "e";n54_em = n54_em + "h";n54_em = n54_em + "h";n54_em = n54_em + "@";n54_em = n54_em + "h";n54_em = n54_em + "i";n54_em = n54_em + "w";n54_em = n54_em + "a";n54_em = n54_em + "a";n54_em = n54_em + "y";n54_em = n54_em + ".";n54_em = n54_em + "n";n54_em = n54_em + "e";n54_em = n54_em + "t"; document.write("Steve Hoelscher"); // --> </SCRIPT>Steve Hoelscher <NOSCRIPT></NOSCRIPT>[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 30px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Silly answer<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 20 2000, 6:57 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 30px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->The exhaust could be red from being rich if the fuel was burning in the exhaust.

    Have you checked the air meter to see if the air door is working correctly? could it be stuck wide open? This would make the motor run rich. Have you check the tail pipe to see if it is making black smoke? Did you check the vaccuum lines to the fuel pressure regulator?

    It could be lean, but it sounds more like the ignition timing went retarded. That would cause the motor to require full throttle to run or even move the car and make the exhaust glow cherry red.

    Check the cam and ignition timing first. Oh, and did you know that driving the car without an exhaust pipe after the header could burn exhaust valves?

    Steve
    <!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]lezesig[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 45px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Burnt valves ?<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 21 2000, 9:12 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 45px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->hmmmmm..let's see. The flow out the exhaust port pulses and is not a continuous flow. This pulse is determined by among other things BACK PRESSURE. Back pressure is created by the exhaust plumbing aft the valve. So if you don't have any back pressure then the hot exhaust flow just rushes past the valve in a contiuous flow. Must get pretty hot much like a blow torch. If the flamefront becomes oxygen rich like an oxy-acetelyene torch with an oxidizing flame then it could probably literally burn steel. Wow, that would probably start removing metal from the valve..probably wouldn't be too good on the seat either. If the valve couldn't completely seal from then on then gases would be allowed to escape past that valve and ignite ? Heard about them exhaust valves that crack and split. Even seen one once. The straightaway cars must have tricks to overcoming burning valves on openheader single passes ? Dunno. Still learning these contraptions.
    lezesig ('79 awaiting tranny bearings!)<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]Anonymous[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 15px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Untitled<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 20 2000, 6:52 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 15px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Deven:

    Have you checked that the ECU connector is properly connected?

    My car had the same symptoms before, but my case was after washing the engine compartment because water found it's way into the connector.

    Other time the connector was simply loose, with the same results as on your car.

    I hope this helps!

    Good luck, Gilles <!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]scott[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 15px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->another possibility?<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 20 2000, 6:53 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 15px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->I know on my '86, I have a heat shield between the stock exhaust manifold and the intake manifold that I believe is suppsoed to keep the fuel rail and hoses, injectors, etc. from overheating. I am thinking that you should also have an auxilliary fan mounted in the rear trunk that feed through the trap door into the engine compartment and keeps the FI components cool...
    Does your new header allow you to keep the heat shield and FI cooling fan setup?

    Hope this might help a little - Good Luck!

    Scott<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]dave[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 15px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->sudden loss of power?<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 21 2000, 9:37 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 15px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->You said the car was running fine and then suddenly lost power. I thnk if the valves are burnt, it wouldn't just happen in a moment. To me it sounds like the timing belt may have jumped some teeth. this happened to a '74' I used to own 10 years ago. It still ran but could really not rev. And if the belt jumps, not only will the valve timing be disrupted, but the distributer which runs of the aux. shaft, which is run by t-belt will lose timing. If the valves were open at the wrong time then some of the hot gases from the combustion process could leak into the exaust. Check the timing marks on the crank and cam pulleys. Good luck.<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<SCRIPT language=Javascript> <!-- var n54_em; n54_em = ""; n54_em = n54_em + "r";n54_em = n54_em + "p";n54_em = n54_em + "b";n54_em = n54_em + "u";n54_em = n54_em + "s";n54_em = n54_em + "h";n54_em = n54_em + "o";n54_em = n54_em + "r";n54_em = n54_em + "e";n54_em = n54_em + "@";n54_em = n54_em + "a";n54_em = n54_em + "l";n54_em = n54_em + "u";n54_em = n54_em + "m";n54_em = n54_em + ".";n54_em = n54_em + "m";n54_em = n54_em + "i";n54_em = n54_em + "t";n54_em = n54_em + ".";n54_em = n54_em + "e";n54_em = n54_em + "d";n54_em = n54_em + "u"; document.write("Robin"); // --> </SCRIPT>Robin <NOSCRIPT></NOSCRIPT>[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 15px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Still could be the ignition<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 23 2000, 2:32 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 15px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->I was surprised when I lifted the hood at night and found a cherry red exhaust manifold on my poorly running carbureted 79. I didn't need a flashlight. My problem was simple -- the distributor hold down nut was loose and the timing was way off.<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR><TR><TD vAlign=top noWrap width="17.9%">[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<SCRIPT language=Javascript> <!-- var n54_em; n54_em = ""; n54_em = n54_em + "s";n54_em = n54_em + "j";n54_em = n54_em + "s";n54_em = n54_em + "@";n54_em = n54_em + "s";n54_em = n54_em + "s";n54_em = n54_em + "-";n54_em = n54_em + "e";n54_em = n54_em + ".";n54_em = n54_em + "c";n54_em = n54_em + "o";n54_em = n54_em + "m"; document.write("Sebastian"); // --> </SCRIPT>Sebastian <NOSCRIPT></NOSCRIPT>[/FONT]
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD style="PADDING-LEFT: 30px" vAlign=top><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->Bingo!<!-- google_ad_section_end -->

    [/FONT][FONT=Trebuchet MS, Verdana, Tahoma, Arial][/FONT]</TD><TD vAlign=top align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial]November 23 2000, 9:47 PM [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=1 width="100%" border=0><TBODY><TR><TD style="PADDING-LEFT: 30px">
    [FONT=Trebuchet MS, Verdana, Tahoma, Arial]<!-- google_ad_section_start -->That is exactly what the problem was. The distributor nut didn't feel loose, but it must have been. A quick turn and the problem was solved..... Good discussion though!

    -S<!-- google_ad_section_end -->

    [/FONT]</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=4 width="100%" border=0><TBODY><TR><TD vAlign=top align=left>[FONT=Trebuchet MS, Verdana, Tahoma, Arial] [/FONT]</TD><TD vAlign=top noWrap align=right>[FONT=Trebuchet MS, Verdana, Tahoma, Arial][​IMG] [/FONT]</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
     
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