Runs fine at startup, after warming up it dies at low speed 5-10
My 2000 chevy tracker runs fine at 10mph+ but if it has been running for a while and i run into traffic and have to run 5-10 mph it will die. if I let it sit for 5 min it will restart. I have replaced the oxygen sensor, before the convertor, did no good(autozone test). Dealership is recommending fuel pump...any insight? Thanks.
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Try cleaning the throttle body and the idle speed control valve, they get full of sludge and this causes stalling. Use a product called CRC Throttle valve cleaner on both parts, DO NOT USE CARB CLEANER IT WILL RUIN THE PARTS.
EFI or CARB
we need this fact.
if carb , and you did a tune up.?
then the carb has issues (99% dirty caused) oldest story on earth.
sound to me, the carb is running leak, hot, just like all old dirty carbs do.
Low pressure from fuel pump, when the pump is cold the pressure increases, as it warms up the pressure drops (this happens in a pump that is going out) the normal pressure should be at 40 with the key on and engine not running, when started the pressure should stay around 36, any less it won't idle and may run as long as you hold the pedal down. The injectors are opened electronicaly, so as long as there is fuel flow the engine gets fuel to run.So check the fuel pump, soundslike you need a new one
if it doesnt blow cold look for the compressor not running when turned on if it is running the feel the pipes were they go to the cowl they should be at least 45 degreees if one is warm and the other is kinda cold then the system is low on charge
Had the same problem with my tracker. Replaced the camshaft position sensor(easy to do yourself, takes about five mins.) Now can drive at highway speeds for about a half hour and stop at the gas station and she'll start back up and run fine. Before i had to wait at least 15-20mins before she would start. Also, if your service engine soon light is on take it to the national chain auto parts stores and they will hook up the code reader for free. The sensor runs about $120.
Well, there are a number of questions that come to mind from a routine maintenance perspective. Seeing that it is a 1991, has the transmission ever been serviced. A complete oil change out and filter replacement should be done every 50K miles or so.
Let me know how many miles you have and if you plan on keeping the vehicle. Regards,
Clean the MAF sensor with electrical cleaner then blow dry with light shop air or just let air dry.then disconnect battery for about 30 minutes to reset keep alive memory.Should take care of your problem.