2002 Blazer Skipping/Misfire
 

Hi all -

Been reading here for a while now, I've had my 02 for about a year. 96,000 miles. Bought from a family member so I know it was taken care of.

Now for the reason we all register here sooner or later.

Recently started skipping, specifically at the 1500-2000 rpm range. Cruising, up small hills and such. Annoying. Replaced fuel filter, replaced plugs and wires.

The problem seemed to be fixed. Had to move a trailed with a small amount of stuff on it yesterday.

Disaster - problem was intensified, to the point that when the blazer skipped the lights will flicker on it.

Check engine light has now came on, going to get the codes and go from there.

From what i've read on here, i'm thinking fuel pump or injector spider.

Thanks tons for any advice

Joshua Martin

Welcome to the forum!

As you've no doubt found here, these things are very fussy when it comes to tune up parts and fuel pumps. Plugs, wires, distributor cap, rotor, and the pump, all need to be AC Delco, no exceptions.

Have the codes scanned and post the DTC's in the order they are retrieved. Before you go any further, install an AC Delco distributor cap & rotor. Very common problem that causes misfires. Be sure to put a dab of silicone dielectric grease on each terminal, (inside and out) of the cap.

Next step will be to check the fuel pressure and leakdown. Most auto parts stores rent/loan the tester for free, and they sell them for ~$40. It's a great tool to have in your tool box, you'll use it more than just a couple of times ;) Let us know when you have one and we can explain how to do the tests.

Codes are likely going to be for misfires. Check the distributor cap, rotor and distributor bushings. My '02 OEM distributor bushings were worn-out at about this same mileage.

Good news is that alumnium shaft distributors are only about $50; check ebay for ones from White.

Thanks for the replies. Going to get computer codes today and start from there

Well, not the news I wanted or expected.

P0870

Off too the transmission shop tomorrow.