'93 mtx cylinder 1 troubles.

[fred93sho]

this has been an ongoing headache hopefully some of the knowledge on here can give me some ideas! any help is appreciated.

The problem: cylinder 1 has a slight misfire or just isn't firing as strong as it should. At idle the car pops and backfires every second or so. it smooths out around 3k and seems fine from there. If I pull the coil off the plug its smooths right out and runs A LOT better on 5 cylinders.

Parts we've thrown at it: plugs (twice), wires (also twice), coil, 1 injector for the problem cylinder, and the CPS. had a comp. test done and that checked out just fine and the valves were all within spec.

The intake has been on and off a few times now trying to figure out the problem. it all started when I had the upper 60k done.

 

[msteiny]

What plugs are u running? Have you tried changing the cam sensor (CID)?

Just a couple things that came to mind. Let us know what u find.

 

[intimdatr]

What plug wiring order are you using?

 

[rubydist]

and what codes are you getting?

 

[Dirk37]

Have you done a compression test on that cylinder?

Also it might be worth a try cleaning the threads, sometimes if anti-seize haze been used it can cause crappy conductivity to the spark plug.

 

[fred93sho]

no codes yet, which sucks because a CEL would help at this point, compression test checked out just fine... thank you for the diagram ill double check that, and i hope dielectric grease was used and not antiseize but thats worth a double check too.

 

[Dirk37]

Another test you could do to determine where the problem lies is switch wires one and four (I believe they fire at the same time) and see if the problem moves or not. If not that would eliminate anything upstream from the ignition wires.

 

[rubydist]

no codes yet, which sucks because a CEL would help at this point, compression test checked out just fine... thank you for the diagram ill double check that, and i hope dielectric grease was used and not antiseize but thats worth a double check too.

you don't need a CEL to have codes - did you check codes or are you assuming none?