Well I took my car up to 1st Capital 4WD today to get dyno tuned and got some bad news. While on the dyno the car would go from rich to lean then rich then back to lean. He also said he found some gas in the crankcase. Could this be from a bad injector leaking or what. Do you guys have any ideas?
Rich and Lean
- Thread starter nic01scgt
- Start date
Lons2001GT
New Member
- Nov 16, 2003
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Too many possiblilities without looking the car over in person and looking at the data log info from the dyno session.
flashstang04
New Member
I though this thread was about a rich skinny chick...oh well,
really, the guy doing the dyno should have been able to tell you something by the data log.
really, the guy doing the dyno should have been able to tell you something by the data log.
I just thought I'd ask you guys to see if anyone else had the same problem. I left the car there over night so hopefully tomorrow he'll have some answers for me. He said he thought it might be a bad injector because there was gas in the crankcase so we'll see. And yes there's a supercharger on there but I don't knwo the numbers 
Well if anyone was wondering what was wrong it was my fuel pressure regulator and my throttle position sensor. I still don't know how that translates to gas in the crankcase? Also what is the normal output for the FPR? He said mine was fluctuating for 10-12 lbs. Could this explain the rich to lean? Also he said my TPS was giving out 1.2-1.3 volts and he said that was bad and I needed a new one of those. Anyone have any comments?
not too sure on the fuel pressure, don't know stock specs
as for the tps, voltage should vary from around .8 (tb closed) to around 4.5 (wot)
if you have a voltmeter you can check for yourself
as for the tps, voltage should vary from around .8 (tb closed) to around 4.5 (wot)
if you have a voltmeter you can check for yourself
hotmustang331
Active Member
Gas in the crank case? How the heck did he come to that conclusing? Did he check your oil, or drain your oil? You need a tune....but it could be the TPS thing that messing you up.
fuel in the crankcase.. are you sure this thing is firing on all cyl. a random misfire can cause the a/f too jump all over the place due too the unburned oxegen from a misfire. the sensor does not pick up the fuel only oxegen so it sees this as a lean condition..
triggz
Founding Member
the stock fuel rail pressure should hover around 40psi regardless of throttle, 36-50 is average fluxuation.
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