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Thread: Compression Test: PSI differences?

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Posts: 11-16 of 16
2008-05-03 20:07:40
#11
Well I will try it again tomorrow with all the plugs out. But I'm seriously hoping that I found my issue.... Crack pulley coming apart.
2008-05-03 20:44:18
#12
Originally Posted by Sentrixx
I'm seriously hoping that I found my issue.... Crack pulley coming apart.


Ah, what problem are you having?
2008-05-03 20:52:38
#13
Basically bogging.... Its been going on for while now. Between 0-3000RPM's. Once over that the car seem to wake up.

when i first checked my timing like 2 years ago found out that it was far advanced in the 20's... Around 25 actually. So bumped it down and have had nothing but problems since. So I bumped it back up and still doing it. But now its set at 19-20*. So I have been working to figure out the issues. Mostly because I'm only getting around 230 to a tank of gas about 23MPG. Which is bull crap.. At least thats what my Scan Gauge says.

As for the Scan Gauge, at idle its reading my timing at 3-8*, which isn't right at all. Should be from 15-17*. At least I would think if thats what it's set at. So from that the only thing I can think of now is that the crank pulley is coming apart.

reason for the compression test.. to narrow it down to see if thats the issue.
2008-05-05 01:00:09
#14
Have you checked your sensors ie maf, grounds and whatever? Around 3000rpm is when the ecu switches how it delivers fuel mpfi to sfi I think and it is going off of more of those sensors before 3k and can't meter clearly after 3k so it starts guessing preprogrammed values. Bad gas mileage makes me think sensors too
2008-05-05 01:07:57
#15
Less than 2 year old o2 front sensor and rear is about 2 weeks old now. Maf is the original sensor. But it is re grounded well as far as I know. As for all other grounds I have no idea where they are. Other than the ECU one that is located on the intake mani.
2008-05-05 01:52:41
#16
Interesting find with the FSM stating what the minimum was...

I found something somewhere in the past that stated that the minimum was 149, and the maximum was 179?

Wierd then. That just simply means that my previous motor was dead to begin with (only had 150 across the board)
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