302 EFI missing under load
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Joined: Mar 2004
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From: canada
302 EFI missing under load
1990, 302 4wd auto EFI
Idle seems OK, engine becomes a little rough when put into gear and misses (bucking might be a good descrition) while under light or heavy load while driving. Basic ignition parts are about 5 months old, I took one good spark plug wire and cycled it into all 8 positions, it made no difference in any position. I also disconnected the spark plug wires one at a time, each one made the truck idle worse. Distributor is clean inside. I replaced the iginition module about 5 months ago, had this one tested today, it failed, got a new one on warentee but the truck stilll runs the same. Had the replacment module tested, it is OK. I looked at a couple of spark plugs, they look great.
I have moved on to fuel now. (Filter is about 5 months old) I listened to all the injectors I could reach, 4 on one side, one on the other. I can hear a distinct clicking in all of them but one. This is on the driver's side, at the rear of the engine. Could this be a problem even though disconnecting the spark plug on this cyclinder made the engine idle rougher?
I would appreciate some help, fuel injectors aren't my thing. Thank-you
Idle seems OK, engine becomes a little rough when put into gear and misses (bucking might be a good descrition) while under light or heavy load while driving. Basic ignition parts are about 5 months old, I took one good spark plug wire and cycled it into all 8 positions, it made no difference in any position. I also disconnected the spark plug wires one at a time, each one made the truck idle worse. Distributor is clean inside. I replaced the iginition module about 5 months ago, had this one tested today, it failed, got a new one on warentee but the truck stilll runs the same. Had the replacment module tested, it is OK. I looked at a couple of spark plugs, they look great.
I have moved on to fuel now. (Filter is about 5 months old) I listened to all the injectors I could reach, 4 on one side, one on the other. I can hear a distinct clicking in all of them but one. This is on the driver's side, at the rear of the engine. Could this be a problem even though disconnecting the spark plug on this cyclinder made the engine idle rougher?
I would appreciate some help, fuel injectors aren't my thing. Thank-you
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From: canada
more information. After noticing the "non-clicking" injector I checked more spark plugs. The plug at the "non-clicker" is damp, not oily. The other three plugs on that bank have a lean burn look to them. Does this support a bad injector diagnosis. If so, are there fixes other than replacement of the injector.
Also this vehicle always stays outdoors, since it has been sitting in my shop, I notice a slight gasoline odor after it sits for a couple of hours.
Also this vehicle always stays outdoors, since it has been sitting in my shop, I notice a slight gasoline odor after it sits for a couple of hours.
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From: canada
This is one heck of a discussion thread I am having by myself. Probelm solved, no further help needed.
The injector was siezed, I checked for electrical pulse, it was there. Next I sprayed wonderstuff into the vent hole in the solenoid body of the injector, waited half an hour then started the engine. Tapped on the injector for a couple of minutes with the truck idling, the truck began idling very smoothly. Kept tapping for another couple of minutes; went for a drive, all seems to be well. This injector now clicks with much more authority than the rest when checked with the stethescope.
If it all blows up, I'll let you know
The injector was siezed, I checked for electrical pulse, it was there. Next I sprayed wonderstuff into the vent hole in the solenoid body of the injector, waited half an hour then started the engine. Tapped on the injector for a couple of minutes with the truck idling, the truck began idling very smoothly. Kept tapping for another couple of minutes; went for a drive, all seems to be well. This injector now clicks with much more authority than the rest when checked with the stethescope.
If it all blows up, I'll let you know