Borrowed a laser temp gun and shot each exhaust port at the head. Did this while waming in idle to limit any inaccurate readings do to heat soak. All except the #1 and #5 were 160*-180*. The number one port was lower at about 110*-120* with the number five way ahead at 300*+.

I diagnosed having a bad injector dumping extra fuel a few weeks ago. So the #5 was no surprise. My question is about the #1. Is a low cylinder temp like that normal? Or do I also have a 2nd bad injector possibly not metering enough fuel???

 

Depends on the firing order, I dont know off hand what it is but if #1 follows #5 which is overfueling, the ecm will cut #1 trying to balance the engine power out.

 

#1 One Is Also Closest To The Fan Which Is Cooled Some By The Fan Turning That Is What I Was Told By The Diesel Tech At Freedom Dodge

 

Anyone else have info on this???

 

In some cases a variance like that is normal, Maybe one of the engine techs will jump in but i feel that #1 probably has better or equal flow, did you check on the same place on the manifold and same distance as all the others?

 

Yes, as close as possible. Even back and forth a couple inches along each runner. There was a slight variance in temps but nothing dramatic, and they all showed the same departure between each port, so the difference/simmularities between each of the cylinders was consistant regardless of where on the manifold the temp was taken.

 

I just sent a set of injectors off to Don , Returned after being repaired and the found they had algee in them. All the lines and filters on the truck were gunked up! I'm sure if you had some algee in one injector it would drop temps (Not sure on this comment) if there was some type of gumming in the injector. It also could be an electronic issue, Or another bad injector!

 

I would change #5 and then retest!

 

I agree switch one (not #1) with #5 and retest. See if the heat variation moves with the injector. Same with #1.

 

For some reason, I never thought of this. Great idea. Before I send them all off to get rebuilt, I will test as suggested and add a note for DDP as to which one is bad.

 

That test has never failed me. Number 5 is your problem. Bring it to the house and we will jerk them out. Its time for a better set anyway! No need in swapping them and testing. You just need a complete new set! Oh, and a dual CP3 setup, cam, springs, twins and maybe some better suspension!

 

WOW!!!! Is all that gonna by my Christmas present from you this year? (oh and don't forget the M&H drag radials why your at it) hope so, cause if not the injectors at least will have to wait till I get my tax rebate end of next month. What i figure on is sending them off to DDP and getting them all rebuilt and reusing the tips. After all, they said they still hold 50,000mi worth of warranty on them, so why not.

If it's cool, prob just drop the truck off on the way to the boat or something and tow the Jeep up for something to drive. Whatever works. Let me know, you know how o reach me.

 

Thats cool. Just give me a shout when you are gonna be passing through and I will clean out a spot in the garage.

Whats this about warranty? Is there any left on them? Was that a joke? You dont have too many miles on those if memory serves?

 

On the nozzles we sent them, yeah. They were done about 115K on the truck, now have 165K. Tips have 100K warranty which leaves 50K left. Thats why I'm reusing them.

 

I know its in the body so I think I would get that one fixed and go about my business! Just my opinion. But then one cant help but wonder what went down in the body? If it was from pressure then surely the others are to follow?

coughsandmumblesdonmunderbreath.