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I have a 2000 Blazer 4WD with 180,000 miles and an automatic transmission. Cruising down the highway at 60 mph, ambient temp is 95 (roughly) degrees, the truck acts like it is running out of gas. Kick it up into neutral and give it gas and it and shuts down. This is after about 30 minutes. Fuel tank is half or better. Fuel pump does not run when key is turned on, but runs when key is turned off, engine cranks, but will not start. Let it sit for 20 minutes or so, fuel pump runs when key is turned on and when key is turned off. Engine will start, but it sputters and usually dies. After about 45 minutes to an hour or longer, fuel pump runs when key is turned on and then off, engine cranks and runs like a top, then dies again. No check engine light or codes in the ecm. I am a mechanic, but do not have a whole lot of expertise with this fuel system and i don't want to needlessly change parts. I thought it might be the fuel pump so today I dropped the fuel tank and installed some fuel line from the outlet to the return on the fuel pump. Let the pump run for almost an hour with no defects or issues. Put everything back together and cranked it up. Ran like a kitten for about ten minutes, then the same thing. Fuel pump relay in the fuse box was almost too hot to touch. Swapped it for the rear window relay and after a while, it started up, but after 10 minutes, the same issues arise. No check engine light, no codes, no truck. No fuses are blown. I have checked the ignition system and there are no issues with that. Any thoughts?
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Hello Theengine
and automatic transmission in this vehicles drive train
are fully electronically controlled by a computer called the PCM and
TCM (Power Train Control Module, Transmission Control Module). When a
problem like this or other drive-ability related problems occurs the
computer stores a record of the problem (there are of course some
exceptions to this, like the fuel pump, engine coolant temperature
sensor and MAF sensor for instance) in the form of a fault code in
its memory, to read these fault codes you must have the systems
memory scanned with a special tool. Once the fault code(s) are read
you then must perform the appropriate diagnostic testing to find and
resolve the problem(s)DO NOT REPLACE ANY PARTS UNTIL
A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR
HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM
Did you flush the grit out of the transmission cooler and the lines to it? If not you may have ruined a new transmission.
Sounds like the transmission is not shifting into a higher gear. 2,500 to 3,000 rpm would be more realistic for a highway cruising speed. The higher rpm may not be a big deal as far as the engine is concerned but it will hit you pocket book pretty good when you loose the mpg that you should get.
I would personally either limit your driving until it can be checked or at least slow down so that the RPMs are in the range listed above.
Let me know what they find, my curiosity is peaked!
if you already replaced the fuel filter, it could be low fuel pressure to engine from a bad fuel pump. check the fuel pump relay first ! it could be getting hot and shutting down. check the fuse too. and run some good injecter cleaner in it, the injecters might be clogging up. good-day !
check the tps ( throttle position sensor ). a bad tps causes transmission shift issues, bucking, jerking, idle surging, engine cutoff, hesitation on take off, surge while cruising down highway. am not saying this does the trick, but it is a good starting point. good-day !
I don't have good news for you.
If you have an automatic tranny on your 4WD this is prohibited, per Toyota. It's your transmission that's probably making the noise. It's lubricated when the engine runs and the transmission pump is circulating oil through the system. During towing, when your drive wheels were spinning with the engine off, no fluid was being pumped through the system. Friction, etc. can quickly wear down bearings and seals, etc.
If this was towed professionally they should have known better... You might have a case due to professional negligence.
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