boatguy95

UPDATE!!!! So i finally resigned to that fact that im just gonna have to get out my wallet. I was taking the truck to have it looked at when my temp gauge started climbing at a red light. Usually stays a needle below 210. it was about 2 needles past 210 and its pretty unusual for that truck. Got to the repair shop that services fleet trucks and started explaining everything thats been done, they symptoms, as well as the new running warm symptom. The tech took it for a drive and it was acting stupid, luckily. I saw the tech talking to another older tech while they had their laptop hooked up. Older guy walked away and came back with something brass in his hands. both techs spend not even 10 minutes under the hood and i see the young guy close the hood. My truck leaves and dude is gone for 45 minutes with it. I am fearing the worst this time fumbling for my insurance card trying to find the roadside assistance to get it towed back. He pulls back in and gets out with his paper floor mat in hand. Come inside says something to the service writer and he looks at me and says its done. Engine coolant temperature sensor. $30.00 part. They broke the pigtail so they had to replace that too. Ran great on the way home took it for a 2 hr drive last night just to be sure. Had all my ponies back and didnt miss a lick. This morning from cold start it fired right up on the first key bump and so far so good. Anyone ever hear of a temp sender causing so much havoc? To be specific it was on the drivers side cylinder head near the #1 cylinder. Right by the spark plug. Even my "Rear Access Open" went away. Gas mileage on the road was about 17 mpg. Fingers crossed that it stays that way but so far so good. Thank you guys for the insight and the help. I really do appreciate it.

Update: So even though the new maf sensor is 8 days old(AC Delco, dealer installed), I put the old one back on, started the same. I also took the one off my girlfriends 04 sierra with the 5.3, same thing when i went to start it this morning. Put my 8 day old MAF on her truck, it runs fine no check engine lights i actually drove it to work today instead of the Denali. The guy at buick/gmc was convinced that even though there wasnt a code for the MAF that 9 out of 10 times its the MAF. So i bought one and had them install it when the did the new throttle body assembly. I guess im the 1 out of 10. NEW PROBLEM THOUGH. Yesterday(sunday) after swapping the maf sensor back to the old one, I got a message on the dash that the rear access was open. Lights would stay on unless dome override. Pulled the panel off the gate and checked the glass and door switches with multi meter, all seemed fine and still interrupted the continuity test. Tried to bypass them with no luck. Put the gate back together. Could this be a failing BCM that is messing with the pcm? Its never done anything goofy electrical really. I had to replace the blend door actuator drivers side and a headlight switch back in 2010, but other than basic maintenance stuff battery alternator etc. Its been pretty good for gm electric wise. Im at a loss and it seems to be getting progressively worse. My next thought is new PCM and BCM, but damn when does the bleeding stop? It also started as a symptom thats got progressively worse. Use to roll once then fire up, then twice then start, then cranking with the auto start while flogging the gas pedal. About 3 months to the point its at now. Just keeps getting worse and worse.

Okay super new to this so if its in the wrong place I apologize. Im not a computer guy. My 2004 GMC yukon Denali 6.0 has about 265xxx on the clock. Its developed a starting problem where if it sits more than 3 hours, it will not start unless you flog the gas pedal like an old carbureted truck with no choke. Once it does start it smokes, smells like raw gas, and you basically keep it at high idle until the fan kicks out. If you have already been driving it, fires up just fine. Let me go into what has been done to the truck as i had it freshened up last year. 1. New fuel pump AC DELCO 2. New intake manifold 3. new knock sensors and harnes (AC Delco) 4. Plugs (ac delco) 5. oil pump 6. another fuel pump 7 entire evap system including both purge valves and charcoal canister 8. Evap system lines 9. all grounds for body electrical and PCM 10.plug wires (ac delco) 11. water pump 12. power steering pump 13. alternator 14. battery 15. radiator 16. 3 clutch fans 17. ac compressor and condenser and dryer 18. broken exhaust manifold bolt extraction. 19. pcm re programmed and flashed 20. throttle body cleaning 21. 8 coil packs (AC delco) 22. 8 new fuel injectors (ac delco) 23. timing chain set. timing cover set 24. rear main seal 25 all tranny fluids and differential fluids transfer case etc and filters I am sure i am forgetting something. I have had this truck to the dealer, local shops, further away dealer, pep boys, even took it to a speed shop in tampa with excellent reviews and all they do is LS. I have had every part replaced at least once with oem parts. I have had this truck a LONG time and it really doesnt owe me anything but it drives nice and it still looks decent. Has no check engine codes. Last weekend it did some reduced engine power message and i limped it to GMC. No codes. Tech said its the cleanest 04 hes ever hooked a computer up to, not even BCM codes for actuators or any of that. Truck runs like dog ******. Uses a ton of gas now. Revs itself up and down upon cold start. Oh yeah brand new throttle body, and mass airflow sensor last weekend. worked great for a day, back to the same ******. Misses at red lights. Fuel pressure regulator is built onto the fuel pump assembly thats why we did it twice even though the values were in parameter, leak down test was fine. No EGR. No fuel filter on the denali( i couldnt believe it either). Pressure is spot on for fuel, running, key on, under load. Almost forgot about the 900.00 gas pedal assembly too. Had a technical done on the harness with tone and resistance, all wires seemed to be okay. Im a boat mechanic, an engine builder we use had the equipment to test the harness on mercruiser(LS GM) and came back fine on resistance on each wire, found two marginal pins in the block temp sensor, they got replaced and new ac delco plug for it. Even had it compression tested(all 8 within 3 lbs and well in parameter) I am out of my mind with this truck. If i wasnt so sentimentally attached to it id never ever put this kind of money into it, but she has been mine since 2007. My ass fits the seat perfectly. We have been married and divorced. If anyone has any other insight on it, I would greatly appreciate it. thanks for your time in reading.... -Chris