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Possible limp mode problem?

 
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Old 04-19-2010, 10:35 PM
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Possible limp mode problem?

. It runs great for about 5 laps (roughly 2 miles) before it starts to break up... bad. It sounds like its running out of gas or something, or like a very bad skip. I realized this weekend that if I slow the car down when this happens (I put it in neutral and held the brakes for a second), it runs good again for another lap or 2.

It runs poorly whether it is in gear or in neutral. It is in 2nd gear, probably between 5500 and 6000 rpms. Also, I don't think my tach works until it starts running badly. This I'm not 100% positive of, but I know it doesn't normally work but it was when I pulled off the track.

The car has a new ECU, coil, and the previous owner put a new distributor on it. Any ideas whats going on here?

Also, I found a white/yellow wire that has been cut off underneath the dustributor that seems to trace back to the ECU. it is wire D1 (battery)

So, my questions are:
1) What do you think my car is doing, and how can I fix it?
2)What is that wire for? Where is it supposed to go?
3)Any ideas why my tach doesn't work?

Thank you so much to anyone who can lead me in the right direction with this
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Old 04-20-2010, 05:26 PM
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Re: Possible limp mode problem?

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Originally Posted by elcabritofresco View Post
. It runs great for about 5 laps (roughly 2 miles) before it starts to break up... bad. It sounds like its running out of gas or something, or like a very bad skip. I realized this weekend that if I slow the car down when this happens (I put it in neutral and held the brakes for a second), it runs good again for another lap or 2.

It runs poorly whether it is in gear or in neutral. It is in 2nd gear, probably between 5500 and 6000 rpms. Also, I don't think my tach works until it starts running badly. This I'm not 100% positive of, but I know it doesn't normally work but it was when I pulled off the track.

The car has a new ECU, coil, and the previous owner put a new distributor on it. Any ideas whats going on here?

Also, I found a white/yellow wire that has been cut off underneath the dustributor that seems to trace back to the ECU. it is wire D1 (battery)

So, my questions are:
1) What do you think my car is doing, and how can I fix it?
2)What is that wire for? Where is it supposed to go?
3)Any ideas why my tach doesn't work?

Thank you so much to anyone who can lead me in the right direction with this
Sounds to me like its a ICM (ignition control module) problem. "It sounds like its running out of gas or something, or like a very bad skip." This is similar to what I had when my ICM was packing up. Worked fine in lower rpm but once i got to 5.5k rpm the car would crap out basically, power becomes irregular and its almost like it doesn't know whats up.

For me it was the ICM, it must have been heat damaged, my old dizzy's bearing was shot but I kept it alive by using grease on the shaft, got another 10k miles out of it but I think over heating eventually killed it. The sensors inside the dizzy are basically magnets, once they get above a certain temp (around 170'F) they loose their strength and thus over time your crank position signals etc go out. In the end the ECU gets a crazy signal from the ICM and, since it needs this to determine engine RPM&fueling/ignition, it cant carry on accelerating for the crank signal is all over the show.

Since you are able to drive normal for a number of laps I would think its only just starting to go or its the dizzy over heating when out on the track. Taking it easy for a little bit must get the temp down a bit which helps it to function again.

You can get a new ICM and throw it in along with the new coil out of the old dizzy but its probably best to get a new dizzy since the magnets inside the dizzy could be the cause.

What I cant explain is the fact that your tacho normally doesn't work but then starts to work once the problem occurs. When it starts to work is it accurate? Do you know if it's the gauge cluster that's the problem? If there is no rpm signal (TDC/CKP from the dizzy) at the ECU you cant drive the car. As for the white and yellow wire, not sure what its function is.
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Last edited by MilanoH22ALude; 04-20-2010 at 05:28 PM.
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Old 04-20-2010, 07:12 PM
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Re: Possible limp mode problem?

Deff the Dizzy
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