Missing under WOT
Thread Starter
Racer
Joined: Aug 2000
Posts: 267
Likes: 0
From: Long Beach Ca
Missing under WOT
a couple weeks ago my car would miss under acceleration some times and some times it wouldn't... I pulled all my MSD plug wires out and one of them was mutilated. I replaced it with a stock plug wire. it was fine for a week, now yesterday when I raced a TT supra, the car misfired again under WOT, but I still beat the supra ;);) I know it's misses because I can feel it, and it's lower on power and the check engine light flashes. I am gonna check my plug wires again tonight. What else could cause this to happen, it doesn't seem to happen all the time, it looks like something is loose somewhere. this happened after my cam change I had NGK sparkplugs put in and MSD wires.
Thanks in advance,
[Modified by YellowZ06, 10:50 AM 11/19/2001]
Thanks in advance,
[Modified by YellowZ06, 10:50 AM 11/19/2001]
Burning Brakes
Joined: Feb 1999
Posts: 933
Likes: 0
From: Santa Clara Ca
Re: Missing under WOT (YellowZ06)
If the light is flashing and goes away is a clue to having multi misfires ( P0300).
I find that many of these high dollar plug wires suck, with their short length, stock ones work just fine.
Have you looked at PCM to see what pending DTCs you have and if so what are they ?
I find that many of these high dollar plug wires suck, with their short length, stock ones work just fine.
Have you looked at PCM to see what pending DTCs you have and if so what are they ?
Instructor
Joined: May 2001
Posts: 114
Likes: 0
From: Chelsea AL
Re: Missing under WOT (YellowZ06)
I'm experiencing a similar problem with my '98 with AT. Under WOT load it will begin to miss at 4500 or so. If I bring the R's up slowly however, it pulls smoothly to redline. No codes are thrown when the misfire occurs.
The gremlin went away after doing the fuel sending unit fix, causing me to think it was a fuel delivery problem. But the problem has returned. Guess I'll replace the fuel filter next, and then proceed to the ignition.
The gremlin went away after doing the fuel sending unit fix, causing me to think it was a fuel delivery problem. But the problem has returned. Guess I'll replace the fuel filter next, and then proceed to the ignition.
Burning Brakes
Joined: Feb 1999
Posts: 933
Likes: 0
From: Santa Clara Ca
Re: Missing under WOT (ThumbsUp)
IHMO,
get a PCM scanner on and record the PCM and this you would know exactly what the problem is. Far easier then having to guess.
John
[Modified by team-zr1, 1:44 PM 11/19/2001]
get a PCM scanner on and record the PCM and this you would know exactly what the problem is. Far easier then having to guess.
John
I'm experiencing a similar problem with my '98 with AT. Under WOT load it will begin to miss at 4500 or so. If I bring the R's up slowly however, it pulls smoothly to redline. No codes are thrown when the misfire occurs.
The gremlin went away after doing the fuel sending unit fix, causing me to think it was a fuel delivery problem. But the problem has returned. Guess I'll replace the fuel filter next, and then proceed to the ignition.
The gremlin went away after doing the fuel sending unit fix, causing me to think it was a fuel delivery problem. But the problem has returned. Guess I'll replace the fuel filter next, and then proceed to the ignition.
[Modified by team-zr1, 1:44 PM 11/19/2001]
Thread Starter
Racer
Joined: Aug 2000
Posts: 267
Likes: 0
From: Long Beach Ca
Re: Missing under WOT (team-zr1)
Here are the codes that were stored when I checked it this morning. Also on the way to work, my fuel gauge went to empty, then after a little bit it was working again and then before I got to work it went to empty again :(
P0300H - Engine Misfire detected-B
P1431H - Fuel Level Sensor 2 Circuit Performance -C
U1064 - Loss Of Communication with DCM
B0516 - Speedometer Signal Circuit Malfunction
P0300H - Engine Misfire detected-B
P1431H - Fuel Level Sensor 2 Circuit Performance -C
U1064 - Loss Of Communication with DCM
B0516 - Speedometer Signal Circuit Malfunction
Intermediate
Joined: Feb 2000
Posts: 30
Likes: 0
From: CA
St. Jude Donor '13-'14, '17
Re: Missing under WOT (YellowZ06)
Ara,
Sorry I can't help you with your problem, don't have a C5. But I do have a question for you, can you call me when you have a chance (714) 883-8682.
Thanks,
Sorry I can't help you with your problem, don't have a C5. But I do have a question for you, can you call me when you have a chance (714) 883-8682.
Thanks,
Thread Starter
Racer
Joined: Aug 2000
Posts: 267
Likes: 0
From: Long Beach Ca
Re: Missing under WOT (Cw)
CW, Actually last time I checked all the plugs the tips were very easy to break loose and I tighten them as much as I could with my fingers, that could be the problem too.. How tight should they be?
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