after about 20 miles the engine warms up and begins to back fire and won't go over 50 mph, it also cuts out and tries to die
2007-07-22 04:51:35 · 6 answers · asked by Anonymous in Cars & Transportation ➔ Car Makes ➔ Chevrolet
Chevy had many different problem items in this year that could create your situation. First, they have the fuel pump in the tank that is atached to the fuel line inside the tank with a rubber hose. That hose over time gets saturated with the fuel and swells up, gets spongy then gets a split in it. There for causing low fuel pressure. This problem is questionable, with your situation, due to the fact it only happens when the truck is warmed up.
Second since it seems to be a heat related issue, I would go to the distrubutor first. I would replace the ignition module, and besure all the wires in the distributor are good. Be sure to clean the surface that the module sits on and put the heat disbursing grease on the surface before installing the new module. Third, check the EGR system. You could have an overactive EGR due to bad spring in the EGR Valve. I almost forgot, Check your radiator voltage. Yes thats right i said RADIATOR. If you have not changed the coolant in the last 2 years, you might have voltage in it because the coolant can become acitic, like a battery, creating voltage on the ground side of your electrical system. Check it when the engine is warmed up and at about 2000 rpms. If you have more than .2(2tenths) of a volt that will disrupt the voltage from your sensors to the computer. Example if your TPS is sending a signal, to the computer, of 3 volts and you have voltage reading of 1 volt in your radiator the computer will only receive a 2 volt signal therefor the enging will run lean. This condition gets worse as the engine warms up. It is easy to check. You need a volt meter, put the negative lead in the radiator and the positive on the negative terminal of the battery and read the voltage. 2000 rpm and warmed up
2007-07-22 16:59:20 · answer #1 · answered by fasttoysmullen 2 · 0⤊ 0⤋
Backfiring can damage the catalytic converter, but backfiring is cause by improper timing of the spark during the compression stroke.
It could be the engine has jumped timing, meaning the timing gear has slipped causing the cam and crank timing to be off.
Do your basic tuneup, spark plug, wires, distributer cap, set timing if you're tight on money, but the best thing is to have it professionally serviced.
Don't keep running it the way it is, you'll cause much more damage.
2007-07-22 12:05:52 · answer #2 · answered by budjon 2 · 0⤊ 0⤋
check the exhaust system, mainly the catalytic convertor. an exhaust pressure check will tell you, anything over 1 PSI is bad
2007-07-22 11:56:09 · answer #3 · answered by Christian 7 · 0⤊ 0⤋
Could be fuel pump or filter, it is the most likely cause.
2007-07-22 11:58:27 · answer #4 · answered by Vince J 5 · 0⤊ 0⤋
Time to sell this thing. sorry
2007-07-22 11:56:24 · answer #5 · answered by Anonymous · 0⤊ 2⤋
Its a chevy lol.....
2007-07-22 12:13:21 · answer #6 · answered by Texas Diesel Power 2 · 0⤊ 2⤋