Any suggestions on why my car mississ and stutters???!!
05-04-2007, 08:20 PM
#1
Any suggestions on why my car mississ and stutters???!! Well just got my rear mount tuned today on 5psi it made 418rwhp. I am happy with that considering I built everyting my self. But It stutters pretty bad if I nail it at low rpm, its fine if I gradually give it gas and pulls like a biotch. The air/fuel is right on the button through all rpms. I'm thinking it could be the plug wires, I did put some tr-6's in a couple days ago, the wires are only couple month old. I checked to see if the boots were on the coil and plugs all the way. I guess I could pull the plugs to make sure they look ok. Any other suggestions would be great. Thanks guys
05-04-2007, 08:51 PM
#2
what stutters the car or the motor. What gear will it shutter in when you nail it?. Your not talking about the diesel effect? like when you start in second and floor it? I dont know what you mean by stutters. is it missing? Tr6s i hear foul real fast if your tuning isnt good. maybe turbo lag? try reving it to 2.5k rpm then lettig it run.
05-04-2007, 10:07 PM
#4
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Are you scanning any data? Getting any knock? Are you running a 2 bar setup? The one thing I can think of is that you are getting too much fuel at any boost level below 5 psi. And that is causing the miss. But, if you're running a 2 bar setup, that wouldn't be it.
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05-05-2007, 09:56 AM
#10
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My buddys car did the ezxact same thing.
The MAF was getting covered in oil .
We cleaned it with the maf cleaner and it would run awsome, after 3 or 4 hard pulls it would run just like you said it would kinda chug at the low rpm in like 4 gear when he would floor it.
clean the maf and the condition was gone. finaly we used a restrictor in the oil supply line and steped up the 1/4 return to 3/8 line. Now hes been driving for two or three weeks, no problems. Howerver your car seems a little rich at 11.7 try like 13.3 or so, you may be going from a rich cruise condition to when you floor it a lean condition causing it to knock and retard timming. you then lose a bunch of power and the chugg-a-lug begins.
hope this helps, 20 minuntes to remove and clean the maf is were I would start.
The MAF was getting covered in oil .
We cleaned it with the maf cleaner and it would run awsome, after 3 or 4 hard pulls it would run just like you said it would kinda chug at the low rpm in like 4 gear when he would floor it.
clean the maf and the condition was gone. finaly we used a restrictor in the oil supply line and steped up the 1/4 return to 3/8 line. Now hes been driving for two or three weeks, no problems. Howerver your car seems a little rich at 11.7 try like 13.3 or so, you may be going from a rich cruise condition to when you floor it a lean condition causing it to knock and retard timming. you then lose a bunch of power and the chugg-a-lug begins.
hope this helps, 20 minuntes to remove and clean the maf is were I would start.
05-05-2007, 10:09 AM
#11
Sounds to me like the tune. What's your timing curve look like? I had some issues on my first tune. We took out too much fuel b/c of how rich it was running at idle. So, as soon as I would floor it, the car would cut all gas for a split second, then pour it in and the car would haul off.
BigJls1...are you freaking serious??? 13.3 AFR on a turbo car?? Bye-bye head gasket! Everything else in your post makes sense, but now I have no respect for you... j/k
But seriously, you can't do that...
BigJls1...are you freaking serious??? 13.3 AFR on a turbo car?? Bye-bye head gasket! Everything else in your post makes sense, but now I have no respect for you... j/k
But seriously, you can't do that...
05-05-2007, 05:24 PM
#12
Just pulled my spark plugs out the electrodes are whitesh grayesh on all of them except number 7. If they look white its runnig lean right? But We have checked the tune over and over its all good throughout all rpm ranges under load and normal driving. I am stumped
05-05-2007, 11:48 PM
#14
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Originally Posted by pdanrichey
Sounds to me like the tune. What's your timing curve look like? I had some issues on my first tune. We took out too much fuel b/c of how rich it was running at idle. So, as soon as I would floor it, the car would cut all gas for a split second, then pour it in and the car would haul off.
BigJls1...are you freaking serious??? 13.3 AFR on a turbo car?? Bye-bye head gasket! Everything else in your post makes sense, but now I have no respect for you... j/k But seriously, you can't do that...
BigJls1...are you freaking serious??? 13.3 AFR on a turbo car?? Bye-bye head gasket! Everything else in your post makes sense, but now I have no respect for you... j/k
But seriously, you can't do that...
I thought he was talking about @ Idle not on boost. I then re-read it before I called you an idot, but I am in fact the idot. But at 5 psi with cold plugs and 91 octane I think 13.to 13.5 you can get away with now 8 psi differnt story. however I will admit thats a comment not for this thread. 
05-06-2007, 10:37 AM
#16
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Originally Posted by BigBenz
Is it a STS kit? You boost the crank case and send oil into the TB. I bet your sending oil to the cylnders. That would make it run messed up. Check your MAF>
Thats what I'm sayin..................
05-06-2007, 02:27 PM
#17
Checked the MAF yesterday sorry forgot to post there is no sign of oil in the maf AT ALL not even moist. I forgot to mention When I pulled the plugs one of them the gap was closed to like 18-20 I guess from install I must have taped the electrode, Maybe that was causing it. Any other suggestions?
Last edited by Eatinstang4life; 05-06-2007 at 02:35 PM.