Quote:
Originally Posted by Gurunutkins
Thanks to - I thought with the euro takeoff just below the throttle plate there might not be so much variation.
no change in idle but that is probably just the megasquirt compensating. with the TPS reading idle it will try and hold the revs lower. This is the car that i modified to run with an electric AAV run from the dash so I can close the AAV down to the warm position so i know its not an AAV leak. I run fuel pressure and AFR guages on the dash so I can see the car is running really rich when it is running at idleand my fuel pressure just sits at 32lbs irrespective of revs. The ignition timing is exact for idle but I cannot check at 3000rpm as it is very wobbly above 2300 rpm and unpredictable even under no load. It will get right up to 5.5k with no problem but bogs down at 2.5 and then just screams up above 3k. Pulled all of the injectors on their rails and checked for injection and all are working fine, pulsing right.
cheers
Barri
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barri,
when you rev the engine, can you see the centrifugal advance operate? Even at 2500rpm, you should see 25 or so BTDC.
I don't think that measuring vacuum at throttle body is meaningful - the airflow and turbulence affects the reading. The best place is via tee into the MPS line. ? I sometimes connect my Mityvac to the connection to the climate controls at back of engine - reads slightly lower vacuum there. Is there any chance your new pressure sensor is leaking
On my car with timing set to about 28deg BTDC at 3000rpm, I am at about 16" Hg. I can get it to about 18" if I fully advance (hard up against end of slot). I used this site back when I was trying to diagnose a vacuum problem:
http://www.secondchancegarage.com/public/186.cfm
Is engine running on all cylinders? All injectors & plugs firing when they should? I once had rich mixture and it was caused by partial failure of the trigger points (you don't have these anymore?). Car became very sluggish.
Maybe a compression test might tell you something?
I am sure YOU will figure out what is wrong!