FastNX

I am experiencing some problems with my tuned ECU. Sometimes all of a sudden it will cut out and not rev past 2000RPM, and to remedy the problem, the car must be shut off and the engine stop completely before the car can be used past 2000RPM. The problem is getting worse and worse. This is in a race car so it's quite detrimental to the racing effort to have to shut the car down mid-race and wait to restart it.

Anybody experience this problem or have any ideas on how to go about solving it?

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exxd

Jeff, How is the condition of your MAF wire?

FastNX

I'm not sure, although the same problem occured with this ECU in my street car. Strange though, in the street car it only happens when crawling in traffic, but in the race car it can cut out anywhere in the powerband.

Come to think of it, the MAF wiring may be faulty, the MAF is located pretty far from the engine, in fact the MAF us upside down just so the wiring will rach the MAF.

exxd

I just started having the same problem, except my maf wire is the problem, If it is the ecu I think I know the problem.

FastNX

which is???

exxd

Well not the same problem, I can start my car and now first start it won't rev past 1.5 to 2k. Turn the car off, Touch the MAF wires and then start the car and its fine. It never cuts out while driving. It only started happening after I made a certain change to the ecu.

tuner325

HELLO, i have same broblem with my ecu tuning with nistune, and my car run corectly with oe ecu .i search a solution

Gabe_Z

After the problem occurs, let it idle once again and do not shut the car off.

Do a diagnostic check and see if anything comes up, this can be done using the diagnostic knob and diagnostic LED, or by using consult.

If it is sensor related it should show up.

McCoy

I'm having an issue similiar to this, did anyone every figure out what the issue was?

FastNX

I never did figure out what the problem was. After this we used a different harness, MAF and ECU and the problem went away. I do recall having drivability problems with later setups, but it almost always turned out to be bent 'legs' on the EPROMS, after taking them out and burning them and putting them back several dozen times one of the legs would get bent just enough to make it run poorly.