Last post on Jul 16, 2013 at 4:58 PM
You are in the Chevrolet Blazer
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Chevrolet Blazer, GMC Jimmy, SUV
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#2407 of 3676 Re: 1997 GMC Jimmy AC problems [bntappleby]
Jun 26, 2006 (3:11 am)
Just saw some info on the defrost problem - if the controls have lost vacuum they default to defrost so look under your hood on the drivers side and see if the vac hose 5/32" is rotted/broken. It feeds off the intake to a T and to a reservior in the fender and I have had to replace all these lines on my newer models also. You can get your hand to the reservior hose with a few trys, really. That plastic line that Ts off should go to the heater controls so if the lines under the hood don't solve it you will have to get to the back of the heater conrols and make sure the line is plugged in. Let us know if that works.
#2408 of 3676 Re: 98 Chevy Blazer will not start [kennedb]
Jun 26, 2006 (3:17 am)
Check the fuel pressure at the rail test port. Key on engine off should be 60psi. When you turn the key on (not try to start can you hear the pump running?
#2409 of 3676 Re: 2000 blazer sputtering problems lack of power [pgurganus]
Jun 26, 2006 (3:27 am)
Fuel filter change (under inside frame rail under drivers seat area). Is the air filter clean. Clean the MAF sensor above the filter with spray MAF cleaner or brake (not carb cleaner and be careful don't break a wire on them). Then fuel pressure test as posted many times above. Then I would get it to a shop and put it on an analyzer/scope and look at the ignition circuit/firing pattern and rule that all out first - yes bad plugs/cap/rotor/wires - can happen. Or a sensor failing but should get a code then. Report the fix for others or can feed you more to look at.
#2410 of 3676 Re: 2000 blazer sputtering problems lack of power [repairdog]
Jun 26, 2006 (5:30 am)
new fuel filte , plugs are a week old, wires cap, roter are less than 3 months old new air filter. when i got the plugs changed they put it on a analizer and no misfires,all firing is good and she starts right up,only on accleration it acts up. funny thing is its not getting a code.as far as the 02's took them out and same thing and didnt even get a service engine light when i took them out.the place i took it to told me maybe a bad computer but i dont think so i think he wanted me to spend money if u know what i mean.....lol
#2411 of 3676 Re: 2000 blazer sputtering problems lack of power [auto9999]
Jun 26, 2006 (5:43 am)
auto9999 did u say u would doubt or wouldnt doubt a cloged exhaust like maybe a clogged cat
#2412 of 3676 Re: 1996 Blazer Upper Vents Not Blowing Air [phantomeagle]
Jun 26, 2006 (6:47 am)
Did you find a solution to this problem? I have the same problem and am looking also. Any help would be appreciated. Thanks
#2413 of 3676 Re: 2000 blazer sputtering problems lack of power [pgurganus]
Jun 26, 2006 (9:02 am)
i think i found the problem,i unpluged the 2 synsors on the air in take from the filter 2 the carb and no more problems so i am going to assume that was the MAF? CORRECT? now my service engine light is on so i am going to go get those 2 synsors can someone tell me what these 2 are. 1 of them is a box like deal the outher is a verry small one that goes inside the breather tube. she is running better but not quite like she should but no more sputtering and she will go
#2414 of 3676 Re: 98 Chevy Blazer will not start [repairdog]
Jun 26, 2006 (11:59 am)
Have not checked the pressure at the rail test port. When key on (not trying to start) I hear nothing...don't hear the pump running.
#2415 of 3676 Re: 2000 blazer sputtering problems lack of power [pgurganus]
Jun 26, 2006 (2:14 pm)
Small one is the intake air temp that is high resistance when cold so a high voltage (5.0) to the PCM and it drops as it warms. The honeycomb with the small resistor is the MAF or mass airflow sensor. I would suspect the MAF but clean it before you replace it and try it out (use MAF spray or brake but not carb cleaner). A new MAF is $150 or so and some sites have trobleshooting tests info on them like autozone.
#2416 of 3676 Re: 98 Chevy Blazer will not start [kennedb]
Jun 26, 2006 (2:19 pm)
Only runs hard till pressure up and may be less noise after a few seconds - but look at the fuse box under the hood for the "ECM B" fuse for fuse pump/ECM/oil pressure power and see if its good, then replace the "F/PUMP" relay and see if it works. If its the pump in the tank its drop the tank and $300 for a pump (dealer is $450) plus labor.