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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 2007

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1997 suburban 5.7 still will not accelerate properly at WOT when engine is hot

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boxing@sasktel.net - 03 Oct 2007 10:27 GMT
I noticed that when I hold the throttle body open and peer in there
with a flash light that the passenger side seems dry and the drivers
side seems a bit oily wet. I was thinking that the fuel pressure
regulator or one of the hoses to the injectors is leaking. I put a
fuel pressure tester on and the pressure is about 50 or 55 with the
engine running. It was  about 20 or so with the key on and the engine
not running. The pressure drops quickly from 50-55 to about 20 when i
turn the key off. I would have thought it should be "gas" wet, not
"oily" wet if gas is leaking. A couple of other things that I happend
upon when doing searches are that maybe the coil is weak or the
distributor drive gear is worn. Any comments?
Steve Austin - 03 Oct 2007 12:48 GMT
> I noticed that when I hold the throttle body open and peer in there
> with a flash light that the passenger side seems dry and the drivers
[quoted text clipped - 7 lines]
> upon when doing searches are that maybe the coil is weak or the
> distributor drive gear is worn. Any comments?

I'm surprised it starts with that fuel pressure.
boxing@sasktel.net - 03 Oct 2007 14:40 GMT
Steve what would normal numbers be?
Steve Austin - 04 Oct 2007 00:29 GMT
> Steve what would normal numbers be?

Spec is 55-61 KOEO. These systems are very fussy about the fuel
pressure.  A couple psi to low will usually show up as hard starting.
They will usually run ok at a couple psi too low. Can you see the
pressure gauge as you turn the ignition key on?
phil - 06 Oct 2007 05:25 GMT
clogged cat. converters are a common failure on these vehicles

> I noticed that when I hold the throttle body open and peer in there
> with a flash light that the passenger side seems dry and the drivers
[quoted text clipped - 7 lines]
> upon when doing searches are that maybe the coil is weak or the
> distributor drive gear is worn. Any comments?
 
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