ok heres the deal on this one i have a 1999 dodge ram 1500 2wd auto i have a problem with number 5 missing i have done a compress test and its about 95-100 specs are 100 not varying between 25 psi between cyl i get spark and i get fuel but if i unplug the injector it doesnt change rpms much for any length of time you can feel it drop maybe 20-30 rpms nothing really but i changed spark plugs and sparkplug is pink and covered in fuel wich tells me that there might not be no spark but i have put wire on manifold started it and watch it spark to manifold for a little while here is a list of things that have been changed since i got it

spark plugs
wires
cap rotor
coil
motor before miss occured 100k miles after it was changed started to miss

it will still pull the code and you can feel it miss but doesnt miss constantly some times it wont miss likes to miss in city driving get on highway alot and the code doesnt pop as much but will still do it its a good thing i live in a small county where there are no emissions testings and all that bull can some1 help me with this problem starting to really get under my skin and dont really want to tear the motor down just to be like well **** that wasnt the problem please help me

 

guess no1 knows?

 

Are you certain that the injector is not clogged on the inlet side? Sounds like you spent a lot of money on parts rather than trying to diagnose the cause.

 

Cylinders 5 and 7 are notorious for cross-firing on our Magnum engines. Re-route these two wires so that they first) Do not touch each other anywhere, and Second) Only cross at right angles. Try and keep the wires at least 1 inch apart at all times. There is a TSB out by Dodge about this issue. I would highly suspect that this is your problem.

 

My first guess would be the wires as well.

If you check and possibly reroute the wires so they are correct, and it still does not solve the problem, check your catalytic converter. They've been known to cause misfires when they are clogged.

 

The clogged cat is more likely to cause a misfire on banks 6 and 8 as they are closest to the exhaust flow.

 

Thats why I agreed with checking the wires first.

 

Man I feel your pain!!!! I recently bought a 99 Ram 1500 SLT 4x4 5.9. It had a slight miss to it on No.5at an idle, but I thought nothing of it....until. After driving it a couple of days, it set a code for No.5 missfire. I started with new tune up and wires...No Change. Then went on to changing around fuel injectors to see if problem would follow...No Change, however I did end up with a nice engine fire when No.7's O-ring ripped without me catching it. Well, after fixing the fire damage, I did a compression check, and found the same as you are talking about. A bit low, but not alarming. I took off the head to reveal that it was cracked between every valve, and the exhaust seat on No.5 had started to collapse into the head. I am in the process of a rebuild and getting it back together now....Hope yours winds up a happier story!!!

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Ouch! Sorry to hear about your head cracking. WHen I had my new engine built I encountered some problems and because of those problems my local machine shop found that both new heads were cracked and both had an attempted repair done to them before I received the engine. Talk about pissed off! Needless to say, 2 brand new heads, fully built to the specs they should have been originally built to, were sent to me at no charge by the engine builder. He also paid all ofthe machine shop costs and mechanic bills associated with their screw up.