leaky injectors?
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
leaky injectors?
After having solid fuel pressure and no line leaks, I caught a few backfires from screwing with the timing (L98). Can backfires destroy injectors? Now the fuel pressure shoots up to normal when cranking, but immediately falls back to zero (like a leak). I smell fuel in the engine bay but have checked all lines and injectors for external leaks - finding none. The only thing I can think of is that one or more injectors are just running fuel straight into the cylinder? I pulled the dipstick and oil cap to smell for gas in the oil, but both sniffs were inconclusive. Is it somewhat reasonable to lose all line pressure through a leaking injector?
I need to pull plugs (and the 9th inj) to check- just wanted to see what the forum thinks. :smash:
I need to pull plugs (and the 9th inj) to check- just wanted to see what the forum thinks. :smash:
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
Re: leaky injectors? (ittlfly)
Do you have fuel pressure by JUST turning the key on for 2 seconds (no cranking)?
Then falls back to zero. It would hold at 36psi or so (turned off) before a few backfires, now it drops to no pressure.
Thread Starter
Melting Slicks
Joined: Oct 2002
Posts: 3,193
Likes: 1
From: Cincinnati Oh
Re: leaky injectors? (ittlfly)
thanks for the IM, ittlfly,
And yes, starting from zero pressure it will do this:
Crank - increase to ~40psi or so as set by my AFPR.
Continued Cranking - won't run smoothly. Starts to but then dies at idle; I may have other issues to work on but pressure will hold so long as the fuel pump is engaged.
Key Off - pressure quickly falls back to zero psi (1 week ago it would level off at 36psi or so for a long time).
Hope this clarifies the situation... but my hunch is also an injector or two. I'm particularly suspicious of the cold start valve, since that is the oldest by far (the other injectors are SVO 24# with approx 5,000 miles on them).
:cheers:
UPDATE:
Pulled the fuel rail and tested the FP. My #7 injector is spewing fuel like a faucet. :( For the price of one injector at the local parts store, I might as well buy another set. Stay with the SVO 24#'s or something else?
:cuss
[Modified by Ramanstud, 6:26 PM 6/7/2003]
And yes, starting from zero pressure it will do this:
Crank - increase to ~40psi or so as set by my AFPR.
Continued Cranking - won't run smoothly. Starts to but then dies at idle; I may have other issues to work on but pressure will hold so long as the fuel pump is engaged.
Key Off - pressure quickly falls back to zero psi (1 week ago it would level off at 36psi or so for a long time).
Hope this clarifies the situation... but my hunch is also an injector or two. I'm particularly suspicious of the cold start valve, since that is the oldest by far (the other injectors are SVO 24# with approx 5,000 miles on them).
:cheers:
UPDATE:
Pulled the fuel rail and tested the FP. My #7 injector is spewing fuel like a faucet. :( For the price of one injector at the local parts store, I might as well buy another set. Stay with the SVO 24#'s or something else?
:cuss
[Modified by Ramanstud, 6:26 PM 6/7/2003]
