Why does my Chevy Tahoe misfire all the time?

But, when the engine gets warm on a hot day, it starts the misfire routine. Appears to be heat related as it will run well all winter. This has been going on for years.

What kind of engine does a Chevy Tahoe have?

My 99 Tahoe with 5.7 Liter Vortec has had the same problem (rough idle at low RPM only when warmed up) for the last few months.

What should the fuel pressure be in a Chevy Tahoe?

When it is running, fuel pressure stays constant at 54 psi, but again once when shut off it bleeds off down to 30 psi. I have read that the fuel pressure needs to stay within 5 psi for 5 minutes or there is a leaky injector or a fuel pump check valve.

What was the problem with my 1998 Tahoe 5.7 Vortec?

Just had the same problem on my 1998 5.7 vortec first it started with just the #6 misfire then multiple misfires. turns out it was a bad fuel injectors. Since i was towing my boat i ignored it for a couple hundred mile till i got to my destination.

What kind of engine does a 99 Tahoe have?

I got a 99 tahoe 5.7 vortec with multiple misfires under load/accelerating. So far Ive replaced; plugs, wires, cap n rotor, coil, egr valve, fuel filter, o2 sensors. Tested; vacuum, fuel pressure, OBD 2 scan. All in which came back ok/no codes.

Why did my 99 Tahoe have multiple misfires?

Re: I got a 99 tahoe 5.7 vortec with multiple misfires… This is one of those situations that a professional diag would of saved you alot of money. Its possible you just got bad gas and your injectors are partially clogged. An 02 sensor would not give multible misfires.

What should the pressure be on a Tahoe 5.7?

If the pressure is above 5psi this would indicate some blockage. It should be below 3psi at 2000 rpm. Also if you have K/N filter the oil from it will coat the maf sensor wires in time,, (always). You can remove the sensor and spray the wires with brake cleaner to clean. DO NOT touch them. They can be brittle.

But, when the engine gets warm on a hot day, it starts the misfire routine. Appears to be heat related as it will run well all winter. This has been going on for years.

Can a 4 cylinder engine misfire on a 3 cylinder car?

If your 4-cylinder engine is misfiring on one cylinder, it may sound like a three-cylinder engine. If your car’s sound is extraordinary, it’s most likely misfires on every cycle that you can hear. So, when you suspect that your engine is misfiring, where should you start looking for the problem?

My 99 Tahoe with 5.7 Liter Vortec has had the same problem (rough idle at low RPM only when warmed up) for the last few months.