There were several issues all at once. I believe they were all contributing. I can't really say what caused the miss. I am just glad that it is fixed.


Don

Finally at long last. Fixed.

After the following:

ECT
Intake manifold gaskets
2 sets of plugs
2 sets of wires
new coil packs

Took it out pushed it from a dead stop to 120 foot on the firewall the whole time. No miss, no stutter nothing. Pulled like it should making between 8 and 9 lbs the whole ...

Ok, all coil packs read .8 (.5-.7) on the primary and 9.12 -9.14 (5k-11k) on the seconday. Car is still throwing the P0300 (random missfire), HP tuners doesn't report a missfire on any cylinder, but shows the P0300. In park, you can rev the car to the rev limiter. It revs easily with no miss. I can ...

oil and coolant are fine, no mixing. I would love to have a vacuum line diagram. Don't now where to find one.

Don

Ok, all coil packs read .8 (.5-.7) on the primary and 9.12 -9.14 (5k-11k) on the seconday. Car is still throwing the P0300 (random missfire), HP tuners doesn't report a missfire on any cylinder, but shows the P0300. In park, you can rev the car to the rev limiter. It revs easily with no miss. I can ...

Archon,
Yes, when Dan got here, the P0300 could was there. He reset it, we let the car warm up (idle) then took it out. He set HP tuners to monitor each cylinder. Eased it up to speed and boost. Started making about 4lbs and the miss started. The SES started blinking and HP tuners showed the p0300 ...

I had a similar problem recently, my car would start to stutter for lack of a better discription. It would only do it under load and when I started to make boost. After changing plugs, and wires. It turned out to be a bad coil and a clogged injector, since changing the coil and cleaning the ...

anyone have any ideas?


Don

00Beast wrote:Look at the oil, and see if there's coolant, and vice versa. The only real way to know is to tear the intake off and replace them with the Aluminum framed gaskets.

Checked the oil and the coolant. Both clean and good to go.

Don

Started a new thread because this is a new problem.

HP Tuners showed 0 missfires on any cylinder even tho the PCM posted the P0300 code. Cylinder balances were all between 91% and 93%. Exhaust velocity/volume feels (by hand) to be good. I am going to replace the fuel filter tomorrow and put the ...

It ran fine for 3 days after I changed the plugs wires and plugs. Does that help narrow down the problem at all?


Don

Haven't changed the filter. Thought I would wait till Dan gets here later today with HP Tuners to see exactly what is going on before I spend any more $$$ on guesses.

Don

Here are the bosch plugs. They were only in the car for about 100 miles.


Don




Front



Rear

Willwren,

Shooting the bosch plugs right now, have them up in about 10 minutes. Thanks again guys

Don

Here is the complete story with all the facts so I can get this resolved:

Bought the car 12/26. 88K 1 owner. Car had a half a tank of 87 octane in it, topped it off with 92. Car ran great, full boost no probs 12/28 changed oil; syntec and mobil 1 filter. Changed plugs and wires. Bosch wires and ...

I have never (in 6 years here) seen a fuel filter cause a misfire.

Pull your front three plugs and shoot a good close-up picture and post it here. We need to see how they're burning. Check your coolant level, report that back, and after running a few minutes, pull your dipstick and inspect inside ...

It did set the P0300 code. The car runs fine if I ease it up to about 4lbs of boost, then it falls flat on its nose and the SES light flashes. Could it be a fuel filter? I don't think it is in the ignition system and I cleaned the MAF.

Changed the ECT. Car is running a little better but still misfiring under load. SES light flashes underload during the misfire condition. Going to take it back and have the code cleared and see what happens next. Running NGK TR55ix plugs, bosch wires. The PCM is not throwing any other codes.

Don

Guys/gals,
Supposed to get do a baseline dyno run today. Not happening.

Got a service engine light code P0128. Car misses underpower. Can the ECT Sensor cause a miss? That is the only code it threw.


Don

I am having a heck of a time finding suspension upgrade parts, strut tower braces, springs etc. Will the gtp stuff of the same year fit?


Thanks

Don