Major Problems Need Your HELP!!1
Multiple Codes..Shuttering..PLease HELP!! I have been trying to diagnose this thing for the last few days. Car has been driving ok but just didn't feel right. Felt a little underpowered and not running quite 100% A little over a week ago I got a heat bank code after hittin the gas for a sec in second gear and then let off when the code was thrown. Car started running shitty and shuttering. Turned car off cleared the code and started back up everything was ok. So same thing..car drives ok but just doesnt feel 100% So the other nught a put it in second about 2000 rpm's and hit the gas...about 3000 rpm's car runs really shitty so I let out and limp it home. Next morning retune with the same tune that been on the car for over a year which is perfect. Start the car and everythings ok. Rev rhe car just over 2000 rpm's throws a code. This one is Manifold Absolute Pressure. Clear it take is for a drive which it runs ok until you hit it a little throws Multiple random misfire. So... today I rep[lace the MAP sensor check the plug wires, maf seems pretty clean, spray carb cleaner for vac leaks and nothing has worked. When you clear it and dont go to high in rpm's runs pretty good. I watched my predator while it was running good and then rev to just over 2200 rpm's to get it to act up and then watched the predator again. This is what I got:
BEFORE REV AT IDLE: CHANGES AFTER REV:
3.14 Engine Load 2.75 Engine Load
179* ECT 190* ECT
0 to -3.91 STFT 0 to +3.91
-3.91 LTFT +2.34 to +5.47
0 to -3.91 STFT 0 to +3.91
-4.69 LTFT +1.56
7.1 psi MAP 8.6 to 9.0 psi MAP
900 RPM
21* Spark
78* IAT 77* IAT
1.16 lb/M MAF 1.13 ib/M MAF
0% TP Angle
all between <H02S Bank
120mV to <H02S Bank
760mV <H02S Bank
<H02S Bank
0.00 Knock Ret
What do you all think???
Also car is an 02 WS6 with lid, full exhaust and 224 on 112 lsa cam
BEFORE REV AT IDLE: CHANGES AFTER REV:
3.14 Engine Load 2.75 Engine Load
179* ECT 190* ECT
0 to -3.91 STFT 0 to +3.91
-3.91 LTFT +2.34 to +5.47
0 to -3.91 STFT 0 to +3.91
-4.69 LTFT +1.56
7.1 psi MAP 8.6 to 9.0 psi MAP
900 RPM
21* Spark
78* IAT 77* IAT
1.16 lb/M MAF 1.13 ib/M MAF
0% TP Angle
all between <H02S Bank
120mV to <H02S Bank
760mV <H02S Bank
<H02S Bank
0.00 Knock Ret
What do you all think???
Also car is an 02 WS6 with lid, full exhaust and 224 on 112 lsa cam
Doc attached of above reading because I dont know how to seperate them
Last edited by TARyan21; Nov 17, 2006 at 10:09 AM.
TECH Enthusiast
Joined: Jul 2006
Posts: 747
Likes: 0
From: sofla
God I hate to say this but it sounds like valvesprings. I had a similar situation recently, had to change the springs t fix it. If one of them hadn't broken after two days of driving around like that, I never would have believed that was the problem. A few of the intake springs on the drivers side were so soft I could push the valve down by hand!
I truly hope yours is an easier solution, but this was my experience. It started while cruising @ 65 on the way to work, started throwing rich/lean codes as well as everybodys favorite p0300 multi misfires detected.
Good luck...
I truly hope yours is an easier solution, but this was my experience. It started while cruising @ 65 on the way to work, started throwing rich/lean codes as well as everybodys favorite p0300 multi misfires detected.
Good luck...
Originally Posted by brad8266
Do you have cats?
No cats. Do you think the 02 sensors would cause it to act like that?
I did get that heat bank code about four times and the first time the car messed up when I hit it a little bit it threw that code and I just ignored it because I had seen it three previous times.
Originally Posted by sprayjunkie
God I hate to say this but it sounds like valvesprings. I had a similar situation recently, had to change the springs t fix it. If one of them hadn't broken after two days of driving around like that, I never would have believed that was the problem. A few of the intake springs on the drivers side were so soft I could push the valve down by hand!
I truly hope yours is an easier solution, but this was my experience. It started while cruising @ 65 on the way to work, started throwing rich/lean codes as well as everybodys favorite p0300 multi misfires detected.
Good luck...
I truly hope yours is an easier solution, but this was my experience. It started while cruising @ 65 on the way to work, started throwing rich/lean codes as well as everybodys favorite p0300 multi misfires detected.
Good luck...
Are you saying a heater code? That is O2 performance but
maybe driven by a false lean reading such as you might get
from an intermittent injector or spark plug wire. You're kind
of limited in what you can see I guess, but why not pull &
reseat every plug wire and every injector connector, and
see what that gets you?
maybe driven by a false lean reading such as you might get
from an intermittent injector or spark plug wire. You're kind
of limited in what you can see I guess, but why not pull &
reseat every plug wire and every injector connector, and
see what that gets you?
Originally Posted by TARyan21
/
No cats. Do you think the 02 sensors would cause it to act like that?
I did get that heat bank code about four times and the first time the car messed up when I hit it a little bit it threw that code and I just ignored it because I had seen it three previous times.
No cats. Do you think the 02 sensors would cause it to act like that?
I did get that heat bank code about four times and the first time the car messed up when I hit it a little bit it threw that code and I just ignored it because I had seen it three previous times.
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Originally Posted by jimmyblue
Are you saying a heater code? That is O2 performance but
maybe driven by a false lean reading such as you might get
from an intermittent injector or spark plug wire. You're kind
of limited in what you can see I guess, but why not pull &
reseat every plug wire and every injector connector, and
see what that gets you?
maybe driven by a false lean reading such as you might get
from an intermittent injector or spark plug wire. You're kind
of limited in what you can see I guess, but why not pull &
reseat every plug wire and every injector connector, and
see what that gets you?
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Verdad Gallardo Ok I have replaced the spark plugs also, I ahve no idea except that it could be the pcm since it's given three different codes. The o2 sensors are now ruled out after they gave the correct readingS through the predator. I now hear a slight noise under the hood and am not sure if it has always been there and I now hear it considering I am listening to everything very carefully. If you guys that have cammed cars could put your ear close to the intake and listen for a slight knock that sounds like the sound everyone makes with their tongue from the roof of their mouth and it is exactly in sequence with the lope of the cam(exhaust). I WOULD REALLY APPRECIATE IT!! Atleast I could rule out a possible major problem. Thanks Guys.
Staging Lane
Joined: Jan 2006
Posts: 64
Likes: 0
If it's a random misfire and your plugs/wire's are good,then I would check the fuel filter and the injectors.You might be running out of fuel at those high load/high RPM situations(ie 2nd gear pull to 3k)I'm thinking you might have a vaccum leak or your hitting a cat overtemp maybe.Just a guess,some things to check
DefEddie
DefEddie