Blazer Forum - Chevy Blazer Forums - 2nd Generation S-series (1995-2005) Tech

Need troubleshooting tips please!!

BlazerNovice92 — Fri, 17 Apr 2026 00:39:06 GMT

Started running poorly a few weeks back, replaced fuel filter because cheap & easy....ran great for about 2 days and then back to rough again, sputtering and sluggish when accelerating and uphill. Feels like a misfire sort of but when unplugging the maf sensor it ran much better for a drive cycle or 2 and then crappy again. So is there anything else I should check before buying a new maf sensor and starting the old game of throw parts at it till Im broke/it's fixed?

oil coolant line parts recommendations

black04blazer — Mon, 13 Apr 2026 00:53:37 GMT

I am not able to source AC Delco oil coolant lines for my 2004 Chevy Blazer (w/ 175000 mi and leaky oil lines). I have decided to NOT do a delete.

I'm seeing a lot of folks report that they need to redo their oil lines not long after a first replacement, whereas I want to do this once.

What exact part(s) from which supplier(s) should I purchase?

Or, if I should attempt to buy an AC Delco part, where would I buy it from? I haven't found any vendors I recognize having this in stock.

Thanks!

Replacing ZR2 Fener Flares

kmenc67 — Sun, 12 Apr 2026 00:22:12 GMT

2004 2DR Blazer ZR2 4WD

I'm in the process of replacing some broken fender flares with some junkyard donor flares and am looking for any kind of guide for removing and installing the OEM flares. I know about the differences between the front mounting strips and rear bracket mounts, but are those rivets holding them to the wheel well? Will I have to drill those out and rivet the replacements in?

Flicker & Dimming Lights! Alternator?

mugenmundo — Mon, 06 Apr 2026 18:32:46 GMT

My Blazer has had a on going issue with lights flickering. It started as a subtle flicker in the dash barely noticeble at very low RPM. It was around the time I replaced the original Alternator with a remanufactured one. It has been 4 years since then and the problem has gotten worse the flicker can be very bad at times in cold startups during cold weather. The headlights are now dimming a tab bit too. Im not sure if the issue is the alternator, but im going to start with buying a new one just to elliminate the portion. I was never content with the remanufactured one I have in there in the first place. Any suggestions on a good replacement? I hear there are GM models that are higher output then the eom 100amp. Anyone know of compatablity on the 4.3L?

leak(s) -- oil coolant lines, maybe other leaks as well?

black04blazer — Mon, 06 Apr 2026 00:13:07 GMT

I have one or more leaks on my 2004 chevy blazer with 175000 miles. It would be awesome if I could get a bit of help interpreting what is going on. I have maintained this car very carefully always changing oil and doing various fluids and other maintenance, and have always driven it gently (never towed) as a passenger vehicle in an area which doesn't get rust and I don't off-road, this is mostly city and highway driving with the very occasional unpaved road.

After washing, the oil coolant lines quite rapidly become wet. The oil pan is wet. If I drive on the highway for an hour, there is a bad smell and my lungs burn. I can see wet oil and burnt oil on the bottom of the pre-cat. There are drops of oil (or some fluid) on the very flat pan to the rear of the oil pan. If the vehicle is left parked, a few drops of oil appear on the ground.

I wiped the intake manifold gasket and it becomes wet again after wiping.

I added UV dye to the oil, drove it 20 miles and waited overnight. There is a faint yellow-green film on the oil coolant lines under the blacklight. I don't see yellow-green on the intake manifold gasket but there is wetness which is a faint orange under the blacklight. I have looked but I don't see obvious yellow-green elsewhere, although it is somewhat hard to interpret what I am seeing. Unfortunately my camera won't show the UV dye even if I try to filter the light using the glasses provided with the blacklight.

1. I would like a recommendation for a reliable aftermarket oil coolant line, if there is such a thing. Some sources are saying I should use braided steel?
2. Are there other issues here I should be checking up on? Is my intake manifold gasket starting to have a problem?

Additionally I am finding that the rpms are tending to fall to 500rpm and below when idling after starting and/or some driving and the engine nearly stalls and shuts off.

Car Scanner - Free Android App Does Cam Sensor Retard

LesMyer — Fri, 03 Apr 2026 01:18:47 GMT

Checked Cam Sensor Retard using Car Scanner (android, free) on my 2001 Blazer today against Dash Command, Car Diagnostic Pro, and Vident hand-held scanner. Used VEEPAK bluetooth OBD2 interface. All agreed, at least for the 2001 V6 engine. App appears to check/clear codes on multiple vehicle systems. Maybe a useful tool. Note that I still doubt it will do CS retard on 1996-97 v6 based on my understanding of differences in PIDs. Likewise, V8 accuracy is unknown but who knows. Someone needs to check it against established scanners that has those vehicles. I suspect it is fine for 1998-2004 Blazers.

Pitman arm Brand Recommendations!

mugenmundo — Wed, 01 Apr 2026 21:22:32 GMT

Im gearing up to do the Entire front end of my truck. Idler, Pitman, stabalizer, links, control arms, shocks. I have already purchased Bilstien Shocks and Moog upper and lower control arms. Also the 1 ton upgrade bracket for the ideler arm. As for the pirtman what do you suggest I pair with the moog k6447 idler? ACdelco, Moog or GM oem. Best in class parts.

Leaking cooling system fixes..

daveca — Sat, 28 Mar 2026 02:56:30 GMT

95 S, 4.3, intake manifold coolant leak into the engine, small amount of water in the oil.

Removed the radiator cap, drilled a small hole in the inner seal and seat to allow the system to run at near zero pressure. Also added Bars Head gasket stop leak. Set the coolant level to just below full at operating temperature.

The excess water out the exhaust has stopped. No overheating.

Also had a problem with temperature swings, drilled a small bypass hole in the thermostat plate to prevent air from being trapped under the thermostat which keeps it from opening.