What are the cylinders that are misfiring on my Tahoe?

I’m having issues with cylinders 1,3,5 and 7 misfiring and running lean. Cylinder 1 and 3 are misfiring the worst according to my diagnostic machine. I’ve changed the intake gaskets, O2 sensor. I’ve changed all the plugs, new wires and the fuel injectors are working fine and not clogged.

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.

How to troubleshoot a GM Truck misfire?

This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see: P0300: Random Cylinder Misfire. P0301: Cylinder #1 Misfire. P0302: Cylinder #2 Misfire. P0303: Cylinder #3 Misfire. P0304: Cylinder #4 Misfire. P0305: Cylinder #5 Misfire. P0306: Cylinder #6 Misfire. P0307: Cylinder #7 Misfire.

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’s the problem with my Chevy Tahoe misfire?

That didn’t fix the issue. So stumped, I did a little more research as after changing plugs and wires, the code changed from a Random/Multiple to a Cylinder 6 Misfire, O2 Sensor B2S1, and Sensor Reference code. So thinking that the upstream O2 sensor could have something to do with it, I went ahead and replaced both upstream O2 sensors.

Is there an engine misfire code on a GM 4.8L?

Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.

How to diagnose random cylinder misfires in Chevrolet?

After I got the check engine light, I started doing some more diagnosis with a bluetooth-OBDII reader which is when I found that I had misfires only on cylinders 2, 5, 6, and 8. Since it was on separate banks, I could find no commonality of items to replace, so I tried the following things. replaced the EGR valve, also with no effect.

What kind of misfire does a Chevy P0300 have?

I read it and it was a P0300 Random/Multiple Misfire. I had experienced a slightly rough idle previously (nothing serious) and had been unable to track it down. I replaced the PCV valve as a course of standard maintenance and it seemed to help get the idle back down, but still slightly rough.

What are the injectors on a 2005 Tahoe?

I swapped the injectors from the bad side to the side with 2, 4, 6 and 8 cylinders and put the ones from the side that’s fine on the side with 1, 3, 5 and 7 cylinders. The side with 1.3,5 and 7 still ran bad and the other side was still good so it showed me the injectors aren’t the issue.

Is the left bank of a Tahoe running?

The left bank with cylinders 2,4,6 and 8 is running perfectly. It’s at least worth looking into. The only other things I can think of would be either vacuum leaks on that bank, EGR issues or a restricted Cat on that side only

Where is the ground terminal on a 2005 Tahoe?

The wire terminal (G103) attaches either to the front or to the rear of the right side cylinder head, depending on the model year of the Full Size Pickup and/or Utility Trucks. If the ECM ground terminal has been found to be corroded, then follow the service procedure outlined in this bulletin to correct the corrosion issue.

How many miles does a 2005 Chevy Tahoe drive?

1st owner drove an estimated 34,470 miles/year • 2nd owner drove an estimated 0 miles/year • 3rd owner drove an estimated 15,698 miles/year • 4th owner drove an estimated 10,460 miles/year • 5th owner drove an estimated 0 miles/year • 6th owner drove an estimated 8,110 miles/year.

Is the Chevy Tahoe still running rough at low rpm?

Since replacing them, it runs much better. It still starts rough, and seems to stutter occasionally at low RPM but seems to be fine under load or at RPM above 1500. At this point I’m completely stumped.

Where was the 2005 Chevy Tahoe last serviced?

Purchased on 04/16/05 and owned in CA until 06/05/20. Driven an estimated 12,472 miles/year. Last serviced at 185,228 miles in Huntington Beach, CA on 11/30/18 • Vehicle serviced • Oil and filter changed. Mileage: 189,519 miles Body Type: SUV Color: Black Engine: 8 Cyl 4.8 L

When did the 5.3 liter engine come out?

The 5.3-liter displacement has remained the same for over 20 years now. It was first introduced in 1999 as a truck variant of the LS engine found in Chevrolet Corvettes and Camaros.

Is the 98 Chevy 5.7 misfire running right?

I have a 98 chevy 1500 5.7. The truck doesnt run right at all. Msifres bad under acceleration. Idle ok when misses when reving and accelerating. I did a full tune up including plugs, wires, cap rotor and a new distributor. With key on i have about 60psi fuel pressure but idleing i only had 50psi.

What are the symptoms of a GM misfire code?

Whether your GM vehicle has a V6 or a V8, if one cylinder or two cut out, it won’t run on 100% engine power and this will cause some of the following consequences (symptoms): The check engine light (CEL) will be on. One or more misfire codes (P0300-P0308) will be stored in your pick up’s PCM memory. P0300 Random Cylinder Misfire.

What’s the misfire code on a 1998 Vortec?

Can someone please help with what I should check next, I have a 1998 Chevy K1500 5.7 Vortec with a misfire, P0300 code for 3 months. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire.

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.