JWT Z32 MAF Chip is in - problems? (long)
10-16-2005, 02:42 PM
#161
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You also have a Turbo - it doesn't put the same amount of charge in the piping at idle that a S/C does.
And Matty has 3" Intake piping which is likely removing some surge also making the variable different.
(Why his car is doing the opposite of mine tho - I'm not sure).
And Matty has 3" Intake piping which is likely removing some surge also making the variable different.
(Why his car is doing the opposite of mine tho - I'm not sure).
10-16-2005, 07:02 PM
#162
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Originally Posted by iansw
How much does your Vortech leak at idle when opened matty?
The Vortech does move quite a bit of air...IIRC its 320cfm at 8psi whatever that means..lol...I do know it moves alot more air than my tiny Greddy BOV..
When I spoke with JWT about the problem they said I shouldnt have ANY air leaking out of the BOV at idle. Thats my problem 100%. Well I went outside, tightened the BOV and the problem was fixed. He then said to replace the Vortech with a HKS SSQ because the HKS version is a "true bov" with two valves. one to open during a small amount of boost and one for high boost situations..
-matt
10-17-2005, 07:18 AM
#164
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So this morning when it was a bit colder out I went outside and tested again.
Nevermind everything I said earlier - it's still stumbling - but again evens out as soon as the car is warm.
Looking at my LM-1 (which I didn't have last time I tested this stuff) - when cold I am 17:1 AFR. When I warm up, it drops to 14.7:! (this is at idle).
Is there any valves that open up during cold start or vacuum lines not used when warm that could explain this? Looks a hell of a lot like a vacuum leak.
(vacuum leaks make you run lean - correct?)
I'm thinking also it could be an injector O-Ring. I'm going to go replace all of those today just to be sure and get a good look around while I'm at it.
Nevermind everything I said earlier - it's still stumbling - but again evens out as soon as the car is warm.
Looking at my LM-1 (which I didn't have last time I tested this stuff) - when cold I am 17:1 AFR. When I warm up, it drops to 14.7:! (this is at idle).
Is there any valves that open up during cold start or vacuum lines not used when warm that could explain this? Looks a hell of a lot like a vacuum leak.
(vacuum leaks make you run lean - correct?)
I'm thinking also it could be an injector O-Ring. I'm going to go replace all of those today just to be sure and get a good look around while I'm at it.
10-17-2005, 07:44 PM
#165
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Weird. I tried this morning to start it wihtout the S/C hose attached at all (this worked well previously and stopped the stutter) - but this time it DIDN'T stop the stutter.
So I thought...maybe the car was just warm anough last time that whatever leak is there had sealed.
So I tore down the manifold and looked aorund - turns out the 2 center bolts on the front of the manifold are stripped. Those bolt holes go straight down into the lower manifold itself.
Might be the source. I helicoiled the bolt holes and am waiting until Saturday when I have time to replace any suspect hose I can find and replace all gaskets and the Injector O-Rings while I'm in there.
So I thought...maybe the car was just warm anough last time that whatever leak is there had sealed.
So I tore down the manifold and looked aorund - turns out the 2 center bolts on the front of the manifold are stripped. Those bolt holes go straight down into the lower manifold itself.
Might be the source. I helicoiled the bolt holes and am waiting until Saturday when I have time to replace any suspect hose I can find and replace all gaskets and the Injector O-Rings while I'm in there.
10-24-2005, 06:00 AM
#168
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<copied from another thread - but may as well have it many places so people don't feel pain again>
Yesterday I found an old thread talking about how the Z32 MAF Harness connector needs to be facing at 90 degrees, instead of up or down.
Tried it this morning on cold start again....
It's fixed! While the idle isn't perfect, at least when cold I can start it and the engine revs without issue (no bucking) and the idle isn't so bad the car stalls out or anything.
Turns out after a year all I had to do was turn the MAF 90 degrees!
So this is why the Z32 MAF doesn't work with the Stillen Charge Piping. It only allows the MAF to sit with the harness facing up or down - not at 90 degrees like it should.
Yesterday I found an old thread talking about how the Z32 MAF Harness connector needs to be facing at 90 degrees, instead of up or down.
Tried it this morning on cold start again....
It's fixed! While the idle isn't perfect, at least when cold I can start it and the engine revs without issue (no bucking) and the idle isn't so bad the car stalls out or anything.
Turns out after a year all I had to do was turn the MAF 90 degrees!
So this is why the Z32 MAF doesn't work with the Stillen Charge Piping. It only allows the MAF to sit with the harness facing up or down - not at 90 degrees like it should.
10-24-2005, 06:15 AM
#169
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Originally Posted by iansw
<copied from another thread - but may as well have it many places so people don't feel pain again>
Yesterday I found an old thread talking about how the Z32 MAF Harness connector needs to be facing at 90 degrees, instead of up or down.
Tried it this morning on cold start again....
It's fixed! While the idle isn't perfect, at least when cold I can start it and the engine revs without issue (no bucking) and the idle isn't so bad the car stalls out or anything.
Turns out after a year all I had to do was turn the MAF 90 degrees!
So this is why the Z32 MAF doesn't work with the Stillen Charge Piping. It only allows the MAF to sit with the harness facing up or down - not at 90 degrees like it should.
Yesterday I found an old thread talking about how the Z32 MAF Harness connector needs to be facing at 90 degrees, instead of up or down.
Tried it this morning on cold start again....
It's fixed! While the idle isn't perfect, at least when cold I can start it and the engine revs without issue (no bucking) and the idle isn't so bad the car stalls out or anything.
Turns out after a year all I had to do was turn the MAF 90 degrees!
So this is why the Z32 MAF doesn't work with the Stillen Charge Piping. It only allows the MAF to sit with the harness facing up or down - not at 90 degrees like it should.
10-24-2005, 07:33 AM
#171
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So you have the connector facing "upward" now, or do you have it pointing to like the battary ??
I descovered this when I was having idle issues, just loopy up and down up and down, and I remebered back to a pic of Stephan's engine and he had the connector facing towards the battary....well I had mine connector facing down towards the ground.
-matt
I descovered this when I was having idle issues, just loopy up and down up and down, and I remebered back to a pic of Stephan's engine and he had the connector facing towards the battary....well I had mine connector facing down towards the ground.
-matt
10-24-2005, 10:44 AM
#172
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TO the battery now.
Idle still isn't smooth however - still pretty loopy all the time - warm or cold. But I also have an exhaust leak - which may be causing that.
Either way - just happy it's drivable again.
Idle still isn't smooth however - still pretty loopy all the time - warm or cold. But I also have an exhaust leak - which may be causing that.
Either way - just happy it's drivable again.
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