I have a 95 Blazer and it's become extremely hesitant and I believe I've narrowed it down to a fuel problem as I've recently replaced the plugs and wires and had a seemingly unrelated oil cooling line issue patched up.

I scanned the computer and it couldn't access both the BCM and PCM but it did give me these codes:
P0135
P0141
P0172
P0306
P1133


I can't replace the pump (too expensive) and I'm hoping there is some sort of Blazer-specific cleaner/additive that would do the trick. I'm pretty sure the pump is original but the filter was replaced 4-5 years ago. Before I go and have the fuel pressure checked and filter and pump fully analyzed, are there any fuel system cleaning tips that you guys can recommend? Are there any "magic potions" out there?

Thanks in advance! This forum has been instrumental in keeping my baby rolling for the past 5+ years, it's going on 206K miles.

 

The only routine additive that I have faith in is Chevron Techron Concentrate Plus, but it's not going to help with the codes you're showing. Nothing in a bottle is going to repair a fuel system problem. They will only help to prevent issues caused by build-up of contaminants.

 

I agree, no such thing as "repair in a bottle".


The first DTC is the only one that can be trusted. Any subsequent DTC's can be set as a result of the first one. P0135 indicates there's a problem with the upstream oxygen sensor heater circuit. It can cause symptoms similar to a fuel delivery issue. The fuel delivery system on your 95 is prone to problems, so it would be best to check it first. The thread below explains how to test it. The procedures are the same for your 95, but the specs are different. After performing all of the tests, post all 4 numbers and we can analyze them. https://blazerforum.com/forum/2nd-ge...eakdown-88305/