What kind of engine does a 1997 GMC Sonoma have?

Random misfire on my 1997 GMC Sonoma, 4.3L Vortec engine. When engine is cold, misfires do not happen much, as it warms up it gets very bad. Misfires happen at any rpm. Here are the things I have tried / points of information. 1. Checked for vacuum leaks with carb cleaner: none found 2.

How many voices does GMC Sonoma GMC engine have?

This topic contains 19 replies, has 3 voices, and was last updated by Matt Brandsema 3 years, 8 months ago. Random misfire on my 1997 GMC Sonoma, 4.3L Vortec engine.

What are the misfire codes for GM 4.3L?

P0303 Cylinder #3 Misfire. P0304 Cylinder #4 Misfire. P0305 Cylinder #5 Misfire. P0306 Cylinder #6 Misfire. P0307 Cylinder #7 Misfire. P0308 Cylinder #8 Misfire. Sometimes, even tho’ the engine is suffering a bona-fide misfire, no misfire codes are registered in the computer’s memory and/or no check engine light (CEL) on.

When does a P0300 GMC engine misfire?

P0300 GMC Meaning When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

What does a P0300 GMC cylinder misfire code mean?

P0300 GMC Tech Notes The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. If no leak is found the next step is to replace the spark plugs.

What should I do if my GMC cylinder misfire?

In Spark Ignition Direct Injection (SIDI) system applications, if a fuel injector fault DTC is set during a misfire event, the ECM will not re-enable the injector. Need more information on how to fix the P0300 GMC code?

Why is there no misfire code on my car?

Sometimes, even tho’ the engine is suffering a bona-fide misfire, no misfire codes are registered in the computer’s memory and/or no check engine light (CEL) on. Lack of power upon acceleration. Smell of unburned gas exiting the tail pipe.

What to do if cylinder misfire on GMC Vortec?

If there’s a chance you know somebody who’d trust you with their scan tool, get your hands on it and look at that misfire counter to see if you can narrow down a particular offending cylinder. If that same scan tool has the counter, it should also have the injector kill test. You can use that as your cylinder contribution test.

This topic contains 19 replies, has 3 voices, and was last updated by Matt Brandsema 3 years, 8 months ago. Random misfire on my 1997 GMC Sonoma, 4.3L Vortec engine.

Why did my Chevy S-10 misfire in the morning?

My morning misfire was caused by a bad intake manifold gasket (a very common problem with most gm models around 2000 model year. Caused by crappy dexcool coolant ). After sitting overnight a small amount of coolant would get into right rear cylinder. It would miss for a bit and then run fine. Doesn’t have to be leaking a lot either.

Can a GMC Jimmy start in the Cold?

I have a 1999 GMC Jimmy with a 4.3 vortex engine and it won’t start in the cold or wet, rainy weather.

Are there any problems with the Chevy 4.3 Vortec engine?

The 4.3 Vortec engines made from 1996-2002 (L35 and LF6) have been reported to have engine knock problems. In a properly functioning engine, fuel burns in even pockets instead of all at once. The pockets burn in even timing, in sync with engine cycles. Engine knock occurs when the fuel burns unevenly and out of sync with the engine cycles.

What are the cylinder numbers on a GMC Vortec?

6. Observed spark plugs in cylinder numbers 1,2,3, and 4 (5 and 6 were tough to get to) and they had a little bit of a white soot like appearance, but I believe this is not bad. They all looked the same. 7. Did a compression test on cylinder number 2, showed 150 PSI.

I have a 1999 GMC Jimmy with a 4.3 vortex engine and it won’t start in the cold or wet, rainy weather.

Can a Vortec 4.3 crank but won’t start?

It cranks like a champ, but just doesn’t start, no check engine light on, and nothing else comes up on the good scanners either. Once it starts there is no problem, so the mechanics working on it have just been changing parts trying to guess, I guess. It has new plugs, wires, distributor cap and rotor, ICM, MAP censor and fuel injectors.

Why does my Vortec not start in the rain?

If it happens in the rain then make it rain use a spray bottle and wet your ignitiodn components especially coil pach and coil wire to distributor. One other possibility could be a crank sensor or the small conn3ctor at the coil pack that commqnds the coil on and off. Have someone crank it while you wiggle it. Good morning folks.

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Is the GMC Sonoma a 2 wheel drive truck?

The Sonoma line is one of the most versatile compact trucks on the market with models and options to suit a wide range of drivers. This extended cab 2 wheel drive model has seating for 5 and Automatic Transmission, A/C, Power Windows and Locks, Tilt Steering Wheel, Cruise Control, AM/FM CD Player, Bed Liner and more…

What did GMC Sonoma do in the 98’s?

For ’98, there is new front door trim with wider armrests and a cupholder integrated into the map pocket. The Sonoma line is one of the most versatile compact trucks on the market with models and options to suit a wide range of drivers.

What’s the price of a 2002 GMC Sonoma?

Description: Used 2002 GMC Sonoma SLS with Upgraded Engine, Rear Bench Seats, 6ft Bed, Extended Cab, 2500lb Towing Capacity. This vehicle is available for sale outside of the auction for $4900. However, the OPENING BID for this vehicle is only $3000 at the PUBLIC auto auction this SATURDAY at 11am.

Can a 98 GMC Sonoma run a 4.3 Vortec?

I Have a 98 GMC Sonoma 2.2 5 speed and i was wondering if a 4.3 vortec out of a 98 GMC Sonoma Or 98 S10 would be the same computer and plug right in to my 2.2 I have been assured by the salvage yard and rodder friends that the engine swap from 2.2 to 4.3 is very painless, but don’t know about driveshaft issues.

What kind of parts do I need for MY 1997 Sonoma?

You have come to the right place if you need new or replacement parts for your 1997 Sonoma. Advance Auto carries over 3,267 aftermarket parts for your 1997 GMC Sonoma, along with original equipment manufacturer (OEM) parts. We’ve got amazing prices on 1997 Sonoma Tools, Fluids & Garage and Accessories, Body & Wipers parts.

What kind of engine does a 1997 GMC Sonoma have?