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| Ignition bug (Page 1/2) |
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shemdogg
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MAY 06, 05:54 PM
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Put the perfectly running 2.8 motor from my kitcar into my 88. Runs good sometimes, runs really bad other times. Went and bought a fuel pressure tester, holding 41lbs key on and about 35lbs running. Only runs for a few seconds by itself, will keep running if im on the gas. Had a code 42, went thru it, now I have a code 34. Manual needs the car running for that test. I think its something else. Module and wiring is good, tried a new coil- no dice. About to break out the parts cannon and throw some new wires n plugs in. Trying to keep the check wallet light off..
Idears?
shem
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theogre
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MAY 06, 09:54 PM
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shemdogg
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MAY 06, 10:50 PM
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I did, no change just tach not working. Feels like a few cylinders are not firing. Burned thru a ton of posts on code 42, the service manual, and your page. My cuz even came over and pulled the rear 3 wires w the motor running, no change on any cylinder one by one. Ill get some plugs n wires tomorrow. Circuit 423 is under 500ohms and jumps to 10k when circuit 424 is powered w a test light, so icm is good. Both wires are good no breaks(mutilated the harness opening it up lol), so im outta ideas. This morning I made a ground wire w connectors to prive a ground from the coil, icm, and tach filter ground to the spot where the negative battery cable connects hoping it was a weak ground issue, no diearoonie. Appreciate the help!
There are 2 icms and an accel coil that came w the car, tried those, runs exactly the same.
shem[This message has been edited by shemdogg (edited 05-06-2023).]
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Patrick
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MAY 07, 03:12 AM
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Did you check both injector fuses? When one blows (usually the one on the same circuit as the EGR solenoid, I believe), the engine can still sort of run.
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olejoedad
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MAY 07, 07:27 AM
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| quote | Originally posted by Patrick:
Did you check both injector fuses? When one blows (usually the one on the same circuit as the EGR solenoid, I believe), the engine can still sort of run. |
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Bingo!
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shemdogg
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MAY 07, 10:02 AM
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Patrick
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MAY 07, 06:03 PM
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| quote | Originally posted by shemdogg:
Both fuses are good.
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It still might be worthwhile checking to see if all the injectors are functioning, as opposed to an ignition issue.
| quote | Originally posted by olejoedad:
Bingo!
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Well, it was worth a shot! 
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shemdogg
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MAY 10, 11:23 PM
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Wrapped up the paint job so im back at this. Tested damn near everything, and everythings working!
Injectors- fuel pressure goes down when I manually ground them w the ignition on
Fuel pump- 41lbson 35lbs running
Ecm- cel works now(bad bulb), aldl fuel pump pin shows power when key on, and power when cranking w oil pressure sensor unplugged. Ckt c15, d14-16 all pulsing when cranking at ecm
Icm- tested good, have 3 to try all same
Coil- have 2, 1 is new, runs the same
Pickup coil- checked out and passed wire wiggle test
Pull injector fuses and run motor, motor runs worse so injectors are working
Had my stepson crank the motor while i fired starting fluid and manned the tb, it kept running so its a fuel issue. The tank in the car was empty, no gas came out when I started the fuel pump. I added 1/2 a gallon and pumped it all out thru the fuel filter. Put on a new filter and ran it, then connected to the motor. Maybe a cupla injectors are clogged or partially clogged? Could anything of size make it thru the fuel filter?
Idears? Anybody? Anybody? Bueller?
shem
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Patrick
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MAY 11, 12:30 AM
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| quote | Originally posted by shemdogg:
Pull injector fuses and run motor, motor runs worse so injectors are working.
Maybe a cupla injectors are clogged or partially clogged?
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Well...
| quote | Originally posted by Patrick:
It still might be worthwhile checking to see if all the injectors are functioning...
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Use a mechanics stethoscope and listen to each injector to make sure they're all at least clicking.
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shemdogg
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MAY 11, 09:20 AM
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Thanks Patrick. Ill have to pull the upper intake to check em, theyre wired together in threes. Both batches clicked when tested. Motor wont run long enough to test w stethoscope. Ill play w it smore after work today
shem
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