2000 Chev. Blazer 4.3 hesitating. No codes


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2000 Chev. Blazer 4.3 hesitating. No codes

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old4x4
New User

Jun 6, 2010, 6:26 PM

Post #1 of 4 (2621 views)

2000 Chev. Blazer 4.3 hesitating. No codes	Sign In

4WD, 2 door, auto trans. It feels like a misfire. More of a hesitiation or stumble on acceleration (lower RPMS) most of the time. No problem starting. Sometimes you can hear it happen at idle. Here's the weird part: This seems to happen once a year, I replace my cap/rotor, and it seems to go away most of the time. Not this year.
Wires/plugs have 15K or so on them and the problem also started before their replacement. Cap, rotor, PCV new. Fuel filter and fuel pump getting replaced as I type this. Orig O2 sensors, orig cat. Fresh tank of Mobil 89 octane. Coil tests good, No pullable codes present except the fuel sender code (which will be new soon). 118K on the engine.. Any ideas? I'm really hoping the engine's just starved for fuel.

(This post was edited by old4x4 on Jun 6, 2010, 6:44 PM)

Sidom
Veteran / Moderator
Sidom profile image

Jun 6, 2010, 10:53 PM

Post #2 of 4 (2612 views)

Re: 2000 Chev. Blazer 4.3 hesitating. No codes	Sign In

If you're planning on changing the pump assembly due to the sender problem....... Do that and see if it helps..........

old4x4
New User

Jun 8, 2010, 10:00 AM

Post #3 of 4 (2606 views)

Re: 2000 Chev. Blazer 4.3 hesitating. No codes	Sign In

OK, got the Blazer back and it seems to drive fine (thought I felt something.....), but I can hear (feel) the rough idle While parked. Whaddya think?

(This post was edited by old4x4 on Jun 8, 2010, 3:57 PM)

old4x4
New User

Jun 9, 2010, 10:39 AM

Post #4 of 4 (2597 views)

Re: 2000 Chev. Blazer 4.3 hesitating. No codes	Sign In

Anyone?

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