just cut the pipe in front of the cat till you get it running right. my sisters ram gets the missfire code every now and then because hers is clogged.

 

cats are useless chuck the thing...i guess it all depends were you live tho

 

No, pressure testing the Cat is the first course of action, because it tends to cause problems on #6 and #8 (closest to the exhaust). In essence, I would argue that those THREE people are wrong.

My questions are as follows:

Was the rotor properly aligned with the cam?

Are you certain the Cam Sensor is clean? When I rebuilt my truck I got misfire codes on the odd banks due to the sensor being dirty.

Did you inspect and clean the fuel rail? Sometimes they collect loose debris.

Per the above: Did you inspect the inlets on the injectors? A clogged inlet can result in a misfire. Running the injector through a sonic cleaner will solve that problem.

Are the spark plug wires routed properly? THIS IS A BIG ONE.

Have you cleaned/replaced or set the spark plugs to the proper gaps?

 

My cat was clogged and the #1, 4, and 3 cylinders were misfiring. Start with the obvious, get rid of the cat. Then take it from there. Why are you waiting to do that?

 

How about pressure testing the cat first, to be certain? Man, you guys can't diagnose shiat. "QUICK, TEAR OUT THAT OLD PART AND INSTALL THIS NEW ONE BECAUSE I KNOW THAT'S EXACTLY WHAT THE PROBLEM IS BECAUSE IT ONCE HAPPENED TO ME AND AFTER $1850 IN SWAPPING PARTS, THAT WAS EVENTUALLY THE CAUSE!!!!!!!!!!"

 

VW I am only going by what he said in his first post as I'm sure everyone else is. The person stated that the cat is bad.

 

 

Sorry I didn't know you were a she but it has no bearing on your engine. My point is and has been if you have a known part that is bad and it has the possibility of causing the current problem it might just be a good place to start. But that's just me. You know the cat is bad if you want a way to relieve some pressure it may be causing remove the o2 sensor before the cat. Your engine isn't going to run right unless it can move air.

 

I'm just going by what she stated. Why are you taking these posts so personal? We're all here trying to trouble shoot problems based on our own experience. I'm just stating what I believe to be the problem. You can dismiss me or take my advice. It's all the same to me. There's just no need to berate or for that matter belittle me or anyone else. Just don't get all sensitive and menstrual, that's all. I mean that in a respectful manor, but felt it necessary to use those words to get my point across.

 

Girl + working on truck = Hella HAWT

Do you know if the fuel pump is operating properly? If possible, see about checking the fuel pressure. I trust you replaced the O-Rings (upper and lower) on the injectors if you dismantled the fuel rail, but if you didn't you'll be lucky if you don't have a fuel leak. Anyway, that's a sidebar issue.

Pull the distributor cap and then remove the CKP (camshaft sensor). Inspect it for cracks and inspect the wire and connector for damage. Yes, this little bastard can wreak a lot of havoc with the engine and firing. If it looks good, clean it thoroughly as well as the contacts. Put some dielectric grease on the connectors and then reinstall it. Check the routing of your plug wires and make certain you have them routed properly. I have a copy of the diagram if you need it. Just drop me a PM with your e-mail address and I'll shoot it to you.

Do the same with the crankshaft sensor. Remove it, inspect it, clean it and the contacts, and reinstall. Then (oh yes, there's more) clean the IAT and test it.

If you can get her rolling again, find a mild grade and accelerate slowly. If she bogs down, then the cat is definitely causing more problems at which point I would recommend your replacing it. How old are the O2 sensors? With a rebuild, and if they're over 60K miles, replace them.

I have a few threads out here with my engine build, so perhaps you can glean some information from what I endured.