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86 2.3 runs fine then will randomly start miss firing and run lean


n_bannerman

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So it started out last summer after i broke a timing belt. Once i got it running again and got the timing right it was running fine for a week then started to randomly miss fire and run really lean for no reason. not throwing any codes other then yet another o2 sensor. its been frustrating. have done tune up after tune up and re timed it. gone threw and checked the injectors and heads. would anyone have any input on what to check? It would be nice to get it running right before wheeling season starts.

Thank for the help in advance.
Nathan
 


Hagan

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Since you played with the timing...my suggestions would be to start with the timing. Have you checked the timing with the little connector detached? (its a weird little connector you have to disconnect in order to time it). And my next suggestion would be to look at the timing belt. Kinda sounds like it skipped a tooth. Does it always run fine then run bad...or is it just running bad now???
 

n_bannerman

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it will randomly go from running fine to running like shit and miss firing bad. jumps back and forth all the time. ill replace the plugs and retime it again.
 

85beast

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it will randomly go from running fine to running like shit and miss firing bad. jumps back and forth all the time. ill replace the plugs and retime it again.
sounds like a bad tensioner.. thats my idea though going off that you have to retime it
 

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