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Well not on the truck, but the wife's trailblazer had catastrophe strike this evening! she was out running errands and calls me... says the temp gauge was at 260 and the battery light was on!!!! I about had a heart attack, told her to shut it down NOW!!! her response was but I'm on my...

Look at the link for the radio diagrams I posted starting on page 271. shows the actual connectors for everything and each pin and wire color for what they are for. for premium sound on page 274 connector C1 for the radio, pin 8 is pink for signal to the amp to turn on. connect the blue wire...

Looks like if it has one, its under the dash.

is there a relay for the amp in the panel with all the other relays? I have not looked up the location for it. the blue wire on the stereo simply energizes that relay to turn on the amp.

if you install a switch to prime or run the LP manually, you will need to add a one way diode at the end of the wire going to the GP controller so your not powering your GP's when you use the switch. that switch is very handy for things like replacing the fuel filter and you need to get the air...

from what I can see, yes, but could still have a factory amp. you also have 6 or 7 speakers. 7th one would be inside the center console.

on the relay mod I linked above, to allow it to prime with the WTS, simply add a wire to the relay terminal 87a (center pin) and run it to the GP stud that feeds out to the glow plugs. when you turn on the key the LP will run priming the system until the glow plugs have heated up.

the lift pump is powered through the ops (oil pressure sensor) a common failure point and why so many of us have done the relay mod. some folks also add a signal wire from the GP (glow plug) controller to energize the added relay so the system will prime while the WTS (wait to start) light is...

from what it sound like, you have air in the fuel system which is a common problem and can be hair pulling to fix. also need to make sure your lift pump is working and providing correct pressure. when they fail it can pull the fuel system into a vacuum and create air leaks from anywhere in...

Here is something I found on another forum about DTC code 18. it might help. I copied it word for word including the links. DTC 18 troubleshooting starts on page 15 of this:Click Here How to test your lift pump and Oil Pressure Switch (OPS): Click Here If the engine stops after 30 seconds...

Lets hope the prom in the current PCM is the correct one for your truck! those things are unobtainum.

and do you know the actual trouble code numbers when you checked them with the scanner? that will help a lot, some are triggered when a specific one is the culprit.

do you still have your old PCM and prom chip? they make a difference and tells the PCM what engine/trans you have along with type of programming. if you have them. can you tell me what the 4 letter code is for the old and the new? I assume you got the new one from a donnor truck. new...

I can't find any pics online to give a visual on the timing chain and IP gears, but there are some decent youtube videos on the timing chain replacement that shows good detail.

Don't confuse the gears that are in front of the timing chain, that is for the IP timing, those have to line up as well too!

unfortunately no you can't see the top of the piston. line up the timing marks on the sprockets if you have the cover off. what codes did you have prior to replacing the PCM, and what codes do you have currently? I assume you swapped the prom chip from the old to the new PCM?

I found your RPO code. UQ3.

C1 grey should be the left front speaker (-) there is also a grey wire on C1 for dimming for when you turn on your headlights.

Look at connector C1 which should be the black connector, look for a pink wire and if you connected anything to it.

Welcome @woolydogg Were all here to help! Give us a little more detail on your truck. what all the issues are and what you and others have done to try and fix it. any upgrades or modifications that have been done as well. best thing is to fill out all the rig details in you account...