Rebuild of my 1980 Euro S
04-23-2021 | 09:36 PM
#288
Rennlist Member
Joined: Feb 2021
Posts: 8
Likes: 1
From: Caledon, Ontario
I need a troubleshooter
Hi everyone, this is the car BigAl1 sold me, my 928 is a 1980 Euro S with the 4.7 (all fresh) and 171,000km on the odometer, the engine management is done by MegaSquirt X3, COP coils, fresh plugs (gapped at .29) and 24lb injectors. I have a readout that shows me air/fuel ratio as it happens and it should be 15.7 as optimal.
I bought the car a few months back and it drove onto the trailer just fine, got it home and took it down the street and back (750m) and it was idling rough, readout says 8.0. The car runs so rich that fuel is spitting out of the tail pipe. When I start it cold it runs at 1500rpm for a few seconds then seems to idle okay at 900rpm, if you touch the gas pedal it stumbles and dies.
I never imagined I was going to get this intimate with my engine, first I checked for spark using a timing gun and found #1 not firing, I took the plug off the coil and the grounds and voltage were right on, put the plug back on the coil and the plug now fires, now #6 isn’t firing, same thing, now #5. Probably a bad ground, I took the wiring harness apart and found nothing unusual, I removed the engine/chassis ground, cleaned, pasted and re-installed, no difference. I bought 8 inline plug testers, I put dielectric paste on all the coil connections and they all fire properly, I tested the injectors with a NOID light and they all work. When I remove an injector plug or 2 the engine just keeps running the same.
I don’t know anything about the MegaSquirt, I’ve had it plugged into the computer and watched things happen but I’m leery about touching anything and the manuals are a university course, (I read proficiently at a grade 3 level). I know I’m going to learn this monster soon whether I like it or not.
There is gas dripping out of the exhaust fittings at this point and I’m wondering if the 02 sensor plays any part in this and will it survive this?
I bought the car a few months back and it drove onto the trailer just fine, got it home and took it down the street and back (750m) and it was idling rough, readout says 8.0. The car runs so rich that fuel is spitting out of the tail pipe. When I start it cold it runs at 1500rpm for a few seconds then seems to idle okay at 900rpm, if you touch the gas pedal it stumbles and dies.
I never imagined I was going to get this intimate with my engine, first I checked for spark using a timing gun and found #1 not firing, I took the plug off the coil and the grounds and voltage were right on, put the plug back on the coil and the plug now fires, now #6 isn’t firing, same thing, now #5. Probably a bad ground, I took the wiring harness apart and found nothing unusual, I removed the engine/chassis ground, cleaned, pasted and re-installed, no difference. I bought 8 inline plug testers, I put dielectric paste on all the coil connections and they all fire properly, I tested the injectors with a NOID light and they all work. When I remove an injector plug or 2 the engine just keeps running the same.
I don’t know anything about the MegaSquirt, I’ve had it plugged into the computer and watched things happen but I’m leery about touching anything and the manuals are a university course, (I read proficiently at a grade 3 level). I know I’m going to learn this monster soon whether I like it or not.
There is gas dripping out of the exhaust fittings at this point and I’m wondering if the 02 sensor plays any part in this and will it survive this?
04-25-2021 | 10:25 AM
#289
Rennlist Member
Joined: Feb 2021
Posts: 8
Likes: 1
From: Caledon, Ontario
it came to me at 3am, i sat up in bed and said to myself "I have a stuck injector", it helps when you write it all down, gives you perspective and the old phrase "Let me sleep on it" works.
The following users liked this post:
no.radar (04-26-2021)
