NO CAR stated , year and engine inside it. 16valve is my guess 1992 to 1995 range.
is the front crank pulley 17mm headed bolt loose? 94ft/lbs only is spec.
compression is 180PSI not 80. do a compression test on any engine, that will not run or has low power. first ( do it with the throttle blocked open)
at sea level not DENVER.
KEY ON< CEL lamp must glow does it.
and then with the DLC diagnostic jumper inserted (paperclip) DTC code 12 blinks out, (means good) all others bad, or worse.
worse CEL dead.
worse CEL can not blink but stuck on. (turn off CEL nag switch if car is FED and not Calif, marked on hood sticKer)
we learn later CEL lamp burned out and when replaced, the ECU is locked hard in to LIMPHOME MODE. (bingo, ) so most of my advice is wrong, for this fact.
and last we learn (last post) the ECU 5VDC REF is dead, end to end, (not just on wires outside) in fact IC17 is blown up.
ECU has many things that can fail, and be 100% dead, bad caps and it crashes over and over, or BACKUPMODE is set.
The ECU 02 sensor shorted makes ECU run SUPER RICH. (even as bad as flooding)
The ECU can go to failsafe (limphome mode) or worse BACKUPMODE.
The ECU must flash code DTC 12, yours does not so that be first. always.
CEL lamp dead or stuck on or flat refuses to flash ANY code on demand is 1st things first act. ( if a FEDERAL car , first defeat the NAG switcH)
good luck with the Dead CEL.
(06-26-2020, 07:43 AM)danstrayer2 Wrote: big problem, please help if you can. Last night I backed up on gravel road for 300 feet, at high speed, pulled in and parked. This morning this happened:are you going to run the engine 300,000 miles on a 60k mile cam timing belt.? sorry had to ask... common failure this. and worse next.
Good start, all sounded well and normal as it has been for a year: in less than 2 minutes, extremely rough, only run (barely) at certain throttle openings, eventually dies completely, heavy fuel usage. No restart. Let sit for 20 minutes, good start, in 45 seconds goes to extremely rough, then no run. Will run at high RPM, with some occasional misfire.
Here is what has been done:
removed cat from exhaust system. Same.
Fuel volume from rail= very good. Fuel pressure in rail just under 40 psi. Return fuel line OK. Tank pressure relieved.
Rail leak-down test=OK, holds 35 lbs for 10 minutes, (very slight drip at my fittings).
Air cleaner removed.
here's the killer: Vacuum test about 10-12 inches hg. Plugs very sooty. It's lke fuel is justbeing dumped, but injectors don't leak, even if one did, all plugs are sooty. 4 injectors did not fail at one moment.
I saw the FSM on exhaust blockage, removed exhaust manifold completely . Problem/symptoms remain.
Could this be valve timing as in slipped belt?
MAF is fine. EGR is OK. It started when I backed up, WOT...coincidence?
I am stumped. It runs really well just like always....then 1-2 minutes just deteriorates to will not run. What can it be?
is the front crank pulley 17mm headed bolt loose? 94ft/lbs only is spec.
compression is 180PSI not 80. do a compression test on any engine, that will not run or has low power. first ( do it with the throttle blocked open)
at sea level not DENVER.
KEY ON< CEL lamp must glow does it.
and then with the DLC diagnostic jumper inserted (paperclip) DTC code 12 blinks out, (means good) all others bad, or worse.
worse CEL dead.
worse CEL can not blink but stuck on. (turn off CEL nag switch if car is FED and not Calif, marked on hood sticKer)
we learn later CEL lamp burned out and when replaced, the ECU is locked hard in to LIMPHOME MODE. (bingo, ) so most of my advice is wrong, for this fact.
and last we learn (last post) the ECU 5VDC REF is dead, end to end, (not just on wires outside) in fact IC17 is blown up.
ECU has many things that can fail, and be 100% dead, bad caps and it crashes over and over, or BACKUPMODE is set.
The ECU 02 sensor shorted makes ECU run SUPER RICH. (even as bad as flooding)
The ECU can go to failsafe (limphome mode) or worse BACKUPMODE.
The ECU must flash code DTC 12, yours does not so that be first. always.
CEL lamp dead or stuck on or flat refuses to flash ANY code on demand is 1st things first act. ( if a FEDERAL car , first defeat the NAG switcH)
good luck with the Dead CEL.
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