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redline4

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According to the TBI brain trust, it is supposed to be between 9 and 14 psi, but they say 10 minimum, or you can get lean backfires back out the tbi, and rough running under load. Two issues I am experiencing. It may well be the distributor as well. But I like to know instead of shotgunning parts. Compression cold is 160 to 170 on all 8 cylinders. It is an '88. Timing is set to zero with that wire disconnected.

I have replaced cap and rotor, plugs and wires as some of the boots broke when I pulled the plugs for the compression test. Plugs looked ok, but I had new ones, so. I do get a good cone of fuel on the throttle plate, and it idles pretty good at 650-675 rpm when warm. Want to like the truck, just haven't warmed up to it yet.


The fuel pressure regulator bolts into the tbi between the injectors. I have seen a few of those fail over the years too. But I bet I haven't seen a tbi engine in 15 years now. Most of the vehicles they were in have returned to the earth here in Wi.
 

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The fuel pressure regulator bolts into the tbi between the injectors. I have seen a few of those fail over the years too. But I bet I haven't seen a tbi engine in 15 years now. Most of the vehicles they were in have returned to the earth here in Wi.

I remember the tin worm. Lived in New England, things rust out so fast. Down here you see all kinds of relics being used as daily drivers. This pickup has rusty fenders, but otherwise solid. Pretty sure my problem is fuel pressure, I try not to use the parts cannon. I am a technician in another field, but troubleshooting is troubleshooting. Will just have to wait until I can test the pressure. Might be the regulator.

Thanks Ed.
 
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