4g61t.org

I did a 4g63 swap on a non turbo colt. it seem like the engine fuel cut at 5 or 6k rpm. the engine sounds like detonating or popping. please give me some idea on what's wrong with the car.

we will need more specifics, like..
exactly when it happens, temperature, only warmed up?

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If speed kills, then i shoulda been dead awhile ago. There is no such thing as "Too Much Power". There is no excuse for a lost race. Do you view the rev limiter as a fun limiter?or as a shift point? And we all know, more boost=more fun.

Which turbo are you running?
Intercooled? If so, which kind and where it is mounted
New fuel filter?
Which fuel pump do you have?
What octane gas are you using?
How old is the gas?
Have you recently switched octane grades?

Do you have a pocketlogger? Knock sensor? Any other diagnostic tools?

-paul

Plug wires, ecu caps, boost leak. Bla,Bla,Bla.

couldnt he have a failing fuel pump that he didnt notice b4 because he had a 1.5?, just a thought

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4g61t.org
4g61t.com

Could be something as simple as plugs and leads

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www.4G93T.net | www.4G61NZ.co.nz | www.SquidInc.co.nz | <RR>

read the post dudes.
4g63=non turbo[/b]

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92' Dodge Colt 200GT - 4G63T - Taking Offers.

High RPM misses are likely three things and I would check them in this order:

Problem: Incorrectly gapped plugs/Incorrect plugs or wires
Solution: NGK BPR-7ES gapped @ ~.028, Magnecore 8.5mm wires

Problem: Not enough fuel/Lean condition
Solution: You should already have the proper instrumentation -- O2's should be over .88v and EGT's under 870C in upper revs.

Problem: Fuel-cut due to ECU seeing too much airflow
Solution 1: Hack the MAS (least favorable)
Solution 2: Add an AFC to fool the ECU's airflow readings and raise the fuel-cut ceiling.
Solution 3: Adapt a 2G MAS to raise the fuel-cut ceiling
Solution 3: Add a GM MAF translator, TRE MASC, or other fuel control (GReddy E-manage, AEM ECU) to eliminate fuel cut completely (most favorable).

HTH,
Bill

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Bill T.

'95 Eclipse GS-T (sold)
'95 Talon Tsi AWD (RIP)
'89 Mirage 4G15 (sold)
'89 Colt GT Turbo (sold)
'92 Galant VR-4 #753 of 1000 (sold)
'99 Eclipse Spyder GSX