Posted: Aug 18 2012 at 10:58am | IP Logged

Hi Guys, I have on 02 that has an issue or 2.  It's a little rough at idle, but I am not sure if that is related to the main problem.  When the truck is cold, it accelereates good, but after it warms up, it is sluggish and surges.  Oh yea, forgot to mention, it's a 3.3 SC motor.  I was thinking mabye a injector shorting out or a cat clogging up.  What do you think.  It hasn't thrown any codes since I have hade it(1 week).  I'm gonna ohm out the injectors today, anyone know what the norm for them is?  Oh, BTW, I am running 87 octane, am I supposeed to use premium in this thing?

Thanks in advance for any input.

Posted: Aug 18 2012 at 12:27pm | IP Logged

davidjbrady wrote: Hello there, I do know that the SC recommends premium fuel, but unsure if this would cause the symptoms you describe. Have you checked the timing? I had similar issues after doing my timing belt, found out when I changed it, I was off a tooth, and it surged a during the shifting.. I had a 5 speed manual. I used to have a 94 pathfinder. David

I'll check that.  Does the SC have 2 seperate timing belts, or chains?  Is there a way to check it without a complete tear down?  Also, I think I will add some octane boost to see if that helps. 

Thanks David

Posted: Aug 19 2012 at 2:32pm | IP Logged

kcidmil wrote: What kind of air filter are you running? K&N will allow a lot of dirt to get in, and the oil from it coats just about everything including the MAF. During warm up the MAF is bypassed by the ECU, but is used once it reaches operating temp to help with fuel trim.

It did have a K&N on it but the Previous owner changed it to a standard.  I pulled the MAF and as you stated, it was coared with black soot(or oil).  Cleaned it with MAF claener.  Looks good now.