Last post on Dec 02, 2013 at 9:06 PM
You are in the Chevrolet Suburban & Tahoe
What is this discussion about?
Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Tahoe Limited/Z71, SUV
#162 of 381 1996 Tahoe Starting and Running Problems (Crankshaft Position Sensor)
Aug 27, 2009 (2:25 pm)
My 1996 Tahoe was having terrible problems starting and running correctly. The initial diagnosis was the crankshaft position switch was malfunctioning. After almost $2000 dollars of replacing the sensor, engine tune-up, fuel filter and fuel pump I was still having the same problems, but not all the time. I had a local mechanic due the work and he said take it to Chevy and have them diagnose the problem, which they determined was still the crankshaft position switch was malfunctioning. Since my mechanic had done the original work I took the Tahoe back to him with the Chevy diagnosis problem. He crawled under the truck with it running and saw the sensor moving around while it was running. He took the sensor out and discovered that one of the mounting bolts screws into a brass fitting inside the plastic timing chain cover. The brass fitting was loose and just needed a screw driver inserted into it to spread it to increase the tension on the plastic cover. My mechanic put it back together and it resolved all my problems, meaning most of the $2000 dollars I had spent trying to fix a problem that ended up being caused by maybe a 25 cent brass fitting in a plastic cover. Live and Learn. By the way my 1996 Tahoe has almost 154000 miles on it with the original engine and transmission.
#163 of 381 No fuel flow from injectors at start
Sep 22, 2009 (7:02 pm)
1994 chevy suburban 1500. will crank, but willnot start. fuel press checks good. no fuel flow from the injectors.Already replaced injectors, inline fuel filter, . Will attempt to start when stat fluid added.
#164 of 381 2004 Tahoe wont start
Oct 05, 2009 (6:55 am)
Have a 2004 Tahoe that has failed to start without any pattern for several months now . Usually at the mall or when out with the kids. All works when I try to start, but will not. All the lights function and the radio and tv work. No sound at all when trying to start. Have had towed to dealer 5 times. My luck, always started when got there. Finally, this week when I went to get car, did not start at the dealer. They now say it is the ignition switch, but need to check to make sure this is the problem. Has anyone had these same issues and had them resolved with success? Thank you.
#165 of 381 Re: 2004 Tahoe wont start [polk1964]
Oct 05, 2009 (7:06 am)
Could be any number of factors, battery, corrosion/loose terminal connections, bad starter or solenoid, key switch (particularly if you have a big ring of keys/weight hanging), security chip programming, etc.
Nice to find a hard failure, where they can meter to find exactly where the problem is. Else, you have to throw parts at intermittent problems, and that can get expensive fast.
#166 of 381 cold start problem in 99 Tahoe w/5.7
Oct 07, 2009 (6:39 pm)
I've been trying to find this problem for months now...
My truck gets progressively more difficult to start, the longer it sets. On mornings when the truck was driven the previous evening, it will start no problem, but will run rough (really rough - will die at idle) for 15 minutes or so then smooth out and run fine once it has warmed up. IF I let the truck set for a full 24 hours or more, it won't start. In the past, during hard start episodes, I could get it to start if I cranked and cranked and cranked (cooling the starter and cables with water on occasion). When it would start, it would act flooded (lots of smoke and sputtering) - then again it would smooth out eventually and run fine. After the initial hard start, subsequent starts during the day would be uneventful. During one of the hard-start episodes, I confirmed spark with a timing light and tried to use starting fluid with no luck. Pulled plugs and they were a mess, so I replaced them.
The motor is a rebuild with about 30,000 miles on it. The fuel pump is a couple of years old. It has new plugs, wires, cap, rotor, coil, ICM, and I have the upper intake off now to replace the fuel pressure regulator (thinking the fuel would leak by during the time between starts).
Am I looking in the right place???
#167 of 381 Pressure Regulator in 5.7 Tahoe
Oct 07, 2009 (6:42 pm)
Is there supposed to be a vacuum hose connected to the port on the side of the pressure regulator on a 1999 Chevy Tahoe with a 5.7? The old one doesn't have one, but the part looks like it's supposed to be connected to something...
#168 of 381 Re: cold start problem in 99 Tahoe w/5.7 [swdodson]
Oct 07, 2009 (7:11 pm)
When you pulled the plugs and said they were a mess.....what did they look like? That's probably your biggest clue.
#169 of 381 Re: cold start problem in 99 Tahoe w/5.7 [kiawah]
Oct 14, 2009 (9:17 am)
They were wet (it was flooded), and covered in black soot. Replacing them was no help. Since my previous post, I have replaced the fuel pressure regulator and the crank sensor. It's now running rougher for a longer period of time (once it does start), but still it will eventually run fine after maybe 20 minutes of roughness... HELP!!! I'm really struggling with this one!
#170 of 381 Re: cold start problem in 99 Tahoe w/5.7 [swdodson]
Oct 14, 2009 (9:51 am)
So do I understand this correctly, that 30K miles ago you put a rebuild engine into your truck, and it has been running fine up until most recently........OR.....you have a rebuild engine with 30K miles on it, and you just put it in your truck and can't get it working right?
Black wet and sooty, is too much fuel with maybe not enough spark.
What error codes are being set in the computer?
#171 of 381 Re: cold start problem in 99 Tahoe w/5.7 [swdodson]
Oct 14, 2009 (10:56 am)
I have a 97 chevy suburban w/5.7 with the same exact condition. Original motor w/180,000 miles with orig trans. Replaced plugs, fuel pressure regulator, crankshaft pos. sensor, checked fuel pressure (which is within specs), Have spark (blue, but seems a little slow, compared to my 94 w/5.7 with orange spark. Checked my ignition timing with a timing light and found it to be incorrect (before and after I replaced the crank pos sensor). I have been dealing with this for over 6 months. I am surprised my starter still works from all the cranking.
Since the ignition timing is computer controlled, I am suspecting the PCM.
Chevy dealership said that they will do a complete diagnosis for $75 and it will go towards the solution, be it computer flashing or whatever.
Otherwise I can get a PCM cheap from the local pull apart, but I'd be taking my chances being that the PCM is to be reprogrammed with your own VIN#.
Just wanted to let you know that you are not alone.