car pop'n under boost.

[Black Power]

it almost sounds like the rev limiter......

But you don't have a tach and can't see rpm besides the scanmaster, right?

I wouldn't think it's the rev limiter, didn't sound like it was wound that tight, but you would know that better than me. What you need is a power logger on that thing, it will show you exactly what's going on at all times when you log a run. I got one and it was money well spent.

 

[unobetr]

there are no rev limiters in the alky chips are there?

 

[jasjamz]

Check the voltage at the fuel pump and post back.
Change the plugs to NGK UR5 or AC CR43TS gapped at a tight 30.
Check that alternator output with lights and stuff on. Post results.
Is the car loosing coolant? Gaskets could be seeping.

 

[unobetr]

ok.. ill check voltage, but my pressure is rising and staying steady.
i have autolite 24's in, gap'd at like 23-24
not loosing coolant.. temp stays around 165-170

 

[Black Power]

His fueling is fine, if scanmaster recall shows .792 after a run, that's right where he needs to be.

 

[unobetr]

ok.. PL installed.. here are 2 files.. now its even sputtering just driving.. and it looks to me the O2 is my cause...

http://slackwaresupport.com/buick/LogFile.dat
http://slackwaresupport.com/buick/LogFile1.dat

 

[Black Power]

Are those 2 files just 2 saves of the same run? It doesn't look like you went WOT, if you did it was getting much voltage from the tps. Was that a WOT run?

Your 02 millivolts are dropping like crazy after you punch it, they should have a much flatter line around low 800s or high 700s when you go WOT.

 

[unobetr]

the car was stuttering just driving.. just replaced o2.. 2 new runs..

http://slackwaresupport.com/buick/LogFile3.dat
http://slackwaresupport.com/buick/LogFile4.dat

 

[TurboBuRick]

Did you check your balancer bolt and crank sensor?

Did you try running with the cam sensor unplugged?

 

[unobetr]

how do i confirm crank sensor?

 

[unobetr]

but would that make the o2's jump around like they are?

 

[TurboBuRick]

but would that make the o2's jump around like they are?

Hell ya! :biggrin:

 

[TurboBuRick]

how do i confirm crank sensor?

Check the center bolt on the balancer first. I see them come loose all the time.

 

[unobetr]

bolt is tight.

 

[unobetr]

how do i check if crank sensor is good?

 

[unobetr]

i have found how to adjust it.. how do i test if the sensor is good??

 

[TurboBuRick]

It either works or it doesn't. Now thats not to say that there is not a problem though. If the reluctor wheel that passes through the sensor is bent and one of the blades is making contact with the sensor, you will have issues. Also check crank end play. If the thrust bearing is worn and the crank walks forward enough, it will also cause these issues.

 

[unobetr]

new crank sensor.. still doing it.

 

[TurboBuRick]

Just popping under boost?

Is it consistent? Stays in rhythm with the rpm's?

 

[unobetr]

yes.. with rhythm..