99 Tahoe stalled while driving on highway, wont restart
Tahoe just stalled on me doing 65 mph, could not get it restarted. hooked up scanner and only got the p0440 code. Checked all fuses and are all good, tried jumping battery (strong) still cant get it to turn over. Any and all help, sollutions or ideas are more than welcome... I am at wits end... Thank you
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Sounds like a week fuel pump have the pressure checked at a local repair shop. Also if it has a lot of miles on it the catalytic converter could be stopped up also have the local shop check it out it is real easy to check.
If the scan will narrow down which o2 sensor it is and replace it. If it has more than one on that year that is. Under load you will probable have a richer fuel mix. If the sensor is going going bad it may only get out of spec reading under heavy load and warmer temps. I have had similar issues with GM and it was easily fixed.
I had a similar problem. When I was driving on highway with 70 mph, the car suddenly stalled everything went off. I managed to get off the road then I tried to start the car, it did not start. After 5 minutes I tried again and it started running but after several hours it stopped while driving again. Took it to the dealer, had the ignition switch changed and it solved the problem. Costed $300. ( There is also a recall on all 99 Acuras for the switch. Mine had been replaced so they did not treat it as a recall. If yours was never replaced you can have it replaced for free)
Has the fuel filter been chg. lately. If it has, maybe a fuel pressure test is in order. Fuel pump might be geeting weak and does not show up until it gets warmed up. Fuel pumps are a common problem on this type of cars.
I used to live on a farm where we had a number of Chevy diesel's in the 90-98 year range. The 6.2 and 6.5L diesel's in those trucks were known to have problems. A very common problem was with the fuel injection pump going bad, causing the engine to intermittently stall for apparently no reason during driving.