2004 Chevy Silverado 1500 4.3

Asked by Nov 03, 2016 at 11:08 PM about the 2004 Chevrolet Silverado 1500 Ext Cab Short Bed 2WD

Question type: Maintenance & Repair

I have a 2004 Chevy Silverado the check engine light
flashes when I'm going up a steep hill it starts losing
pressure I replaced the Cadillac converters and the spark
plugs and distributor cap and wires I go 65 miles per hour
then it drops down to 40 miles per hour and the vehicle
starts to shake and loses pressure what can be the
problem

7 Answers

69,325

A flashing check engine light is warning you that the engine is misfiring and damaging the catalytic converter. Sounds like it's misfiring under load. This is an ignition system problem. Check your ignition coil since a tune up didn't seem to solve the problem. Did you replace the distributor rotor? You didn't mention that. If not, replace the distributor rotor and check that ignition coil sounds like it's failing. HTH. -Jim

98,385

Could be leaning out under load, have the codes pulled and see what they say, as you had a flashing light it should have stored it in memory.

I already replace the distributor cap

10

Mi Chevy 2004 vivra y pierde fuerza despu├ęs de manejarla por unos 20 minutos y flashea la luz de chek engine

1 of 1 people found this helpful.

First off an 04 doesn't have a distributor cap, it has coil packs. So there's no way you could have replaced it. You might want To find out where it's misfiring and replace the coils on that cylinder

98,385

This was 5 months ago, so no news is good news.

1 of 1 people found this helpful.

Have anyone tried changing the sensor on the gas peddle? Seems to be another bad part of gmc

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