- Joined
- May 18, 2008
- Messages
- 1,510
- Reaction score
- 368
- Points
- 83
- Location
- Vancouver area BC Canada
- Vehicle Year
- 92 & 83 project
- Make / Model
- Ford
- Engine Type
- V8
- Engine Size
- 4.0L 302
- Transmission
- Automatic
Extremely confused on this one. After a blown gasket replacement for the 5&6, the engine has what feels to be 2 dead cylinders.
From the start... when I bought this truck it had a strange miss,so I just replaced the engine with a good 1 I had from an explorer that I scrapped (kept engine as it was very low mileage). after replacing the engine I rechecked all the wire harness and the engine ran tip top till last week when I cooked the head gasket on the driver side, hence the tearing off the heads to replace a new set of gaskets.
After the original heads went back on, the engine had the same bad miss back in the last 2 cylinders.
OK thinking something not 100% correct decided to take off the head again and double check it and block; everything was A-OK. However, I decided to place another head that I have back onto the engine. ( I knew it is a good head) After bolting everything back up and doing everything humanly possible to get the engine running, still is bad miss. can pull either plug wire and the engine makes no difference.
what I have done - tested so far.
Compression tested the 2 pistons, both hit 150 PSI
Spark plug tested great spark, tested the electrical for the injectors, test light lit up in flashing for fire.
No oil is being burnt in the compression chamber, no steam from tail pipe either.
My guess is this is some ghost in the electrical system. what sensor(s) should I test or replace from my parts trucks)?
Any ideas? i am all ears. (1992 4X4 OHV style block)
From the start... when I bought this truck it had a strange miss,so I just replaced the engine with a good 1 I had from an explorer that I scrapped (kept engine as it was very low mileage). after replacing the engine I rechecked all the wire harness and the engine ran tip top till last week when I cooked the head gasket on the driver side, hence the tearing off the heads to replace a new set of gaskets.
After the original heads went back on, the engine had the same bad miss back in the last 2 cylinders.
OK thinking something not 100% correct decided to take off the head again and double check it and block; everything was A-OK. However, I decided to place another head that I have back onto the engine. ( I knew it is a good head) After bolting everything back up and doing everything humanly possible to get the engine running, still is bad miss. can pull either plug wire and the engine makes no difference.
what I have done - tested so far.
Compression tested the 2 pistons, both hit 150 PSI
Spark plug tested great spark, tested the electrical for the injectors, test light lit up in flashing for fire.
No oil is being burnt in the compression chamber, no steam from tail pipe either.
My guess is this is some ghost in the electrical system. what sensor(s) should I test or replace from my parts trucks)?
Any ideas? i am all ears. (1992 4X4 OHV style block)