how do u check if the timeing is correct? i bought a 1991 sho and it has been missfireing since ive had it i have put new valve cover gaskets, intake gaskets, bbbs, dis, spark plugs and wires, coil pack, new spout connectors, ect sensor... currently i have no codes and it is jus missfireing horribly.. when we got it we took the timeing cover off and someone before me has already changed the timeing belt.. so thats wat leads me to this im wondering how to check if the timeing may be off.. any help would be much apreciated thanks...:thankyou:
help with timeing!!!!!!!!
- Thread starter shoftw
- Start date
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Eric VerValin
PiMPSKiLLET
How did you determine your spark plug routing? Do you have a book perhaps? And if so.. which book is it?
you can check the timing w/o having to pull everything apart - you turn the engine over until the mark on the crank dampener pulley is lined up with the 0 mark on the lower timing cover. then you remove the upper timing cover and look to see that the dots on the 2 cam sprockets are lined up with the marks on the rear timing cover. if all lines up, timing is correct. if not, then timing is not.
I have found that cam timing can be way off w/o causing a misfire, but will cause power to be way down and emissions to be way up.
I would look elsewhere for your miss problem - plug wire routing is a common error, as Eric has suggested.
I have found that cam timing can be way off w/o causing a misfire, but will cause power to be way down and emissions to be way up.
I would look elsewhere for your miss problem - plug wire routing is a common error, as Eric has suggested.
jmpSHO2nd
SHO Member
Like everyone said make sure the firing order is correct. Some repair manuals had the firing order wrong.
Engine
123
456
Coil
5 1
6 2
4 3
Engine
123
456
Coil
5 1
6 2
4 3
Last edited:
stangeater
Farm Boy
I've been having this same problem in my 92. I've replaced almost everythinig trying to figure it out too. Let me know if you figure it out. I checked my timing, and it's perfect, and I'm still having the horrible miss fire. I'm going to change out my injectors this week to see if that may be the problem.
Good luck!
Eric VerValin
PiMPSKiLLET
Or.. take a look at those injector seals... those could be giving out.. creating a vac leak.. ask Boat about that... lol they can leak when their good too.. lol
thanks for the help but i got the plug wire routing off of here and ive checked that numerous times lol... its all jus frusterating... and thats for the help ruby dist im gunna go check that right now i jus want this car running lol.. and stangeater ill keep u inforemed if i can figure mine out :thankyou:
msteiny
Active Member
I have a 93 that backfired. I replaced the cam sensor and it seemed to fix it. Hasn't backfired in months.
my car is finally running right!!!!!!!!! yay lol it was my fuel injectors i got some yesterday from the junk yard and they were out of a 3.2 and it is running amazing.... my first sho and i jus felt the power out of it last night and i was like 
lol it feels amazing
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