Last post on May 06, 2013 at 7:36 PM
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Chevrolet Blazer, GMC Jimmy, SUV
#274 of 486 Rough starts but runs fine
Apr 28, 2009 (8:08 am)
Have a 2001 4.3 chevy blazer. have replaced spark plugs, fuel filter, air filter, egr valve. engine runs fine gets satisfactory gas milage. My problem is the initial start. Engine rumbles upon on start-up. Like the whole engine shakes. Engine always starts and runs fine but the initial start is always rough. when you shut the engine off it does the same thing. Some times worse than other. Any suggestions why this is happening? More of an annoyance than anything.
#275 of 486 1990 chevy blazer need sum help!!!!
May 16, 2009 (10:48 am)
1990 full size blazer with a tbi 350 its stalling out only after it gets warm idles great then try to rev it up after its warm and it stalls out 1800 rpms even does so while driving but always restarts.it hasnt thrown any codes good coil cap, rotor and wires can anyone help???
#276 of 486 Re: 1990 chevy blazer need sum help!!!! [marasmom25]
May 16, 2009 (3:28 pm)
#277 of 486 1995 Chevy Blazer
May 25, 2009 (10:49 am)
Hi, I've been reading the passed posts and found it very interesting, I've had my Blazer for over a year now, and want to tune it up. My little sissy truck ran fine up until I got the brite idea to drive from florida to virginia (some 1800 miles). Before I left I changed the oil, the battery, and the air filter. The plugs, rotor and cap had been replaced with in a the passed 6 month so i thought nothing of it. I left on a rainy morning, it rained most on the way up and back. I noticed about the South Caralina border and the Service engine soon light came on border the engine was running a little ruff, and the Catalytic converter sounded like it had hole in it, the brakes had no vaccum assist and were hard to push. the further north I went the worse it got it would stall at lights and idol fast and slow, but seemed fine on the highway. In virginia I changed the plugs cap rotor and PVC valve. No change, i raised the idol a little so it would run at stop lights. And headed back to Florida. Another damp trip, but the truck seemed to run better the further south I got. Any ideas of what may have caused this. It still seems tempermental but is running a little better. The truck is old with over 200,000 miles on it but up until now the only trouble i've had is a fuel pump and tires. Also i noticed alot of carbon (black powder around the mouth of the intake can this be cleaned out like a regular carb (spray gunk) and is there anything else I can changeout during a tune up? THanks
#278 of 486 Re: 1995 Chevy Blazer [jyoung4478]
May 25, 2009 (8:44 pm)
Okay, first off, not carb cleaner, but throttle body cleaner. Something different in the chemistry.
Second, check the vacuum line coming from the intake manifold over to the vacuum resevoir. Would be in the area around the brake booster.
#279 of 486 CRANKING PROBLEMS
Jun 15, 2009 (4:11 pm)
I have a 2001 Jimmy GMC and some days my truck will start and some days it won't I have put it on a computer and it's not reading any problems. I have changed the rotor,distri.cap I have reset the computer,and they say nothing's wrong with my fuel pump it's giving the right reading could anyone help me with this problem and when this started it's hard to put it in gear please help me anybody
#280 of 486 starting problems 97 blazer
Jul 14, 2009 (3:42 pm)
my blazer wont start unless i spray carb cleaner in the carb.i've read that u need 60 psi to start but mine only has 50 to 55 key on engine off.it has a new fuel filter so dose that mean i just need to replace the pump? btw once i get it started it runs fine and useully will start again but not after sitting all night.plz help
#281 of 486 Re: starting problems 97 blazer [spck68]
Jul 14, 2009 (8:12 pm)
Sounds more like a leaking fuel spider assembly. 55 psi is probably enough to get it going, and not likely to increase once started. If the fuel pump were bad, it wouldn't want to keep running.
You said this is a '97 model. You shouldn't be spraying carb cleaner into it as there are components that can be harmed. You might try taking the MAF out and cleaning it with an approved cleaner. The throttle body can be cleaned, but should be done with throttle body cleaner, not carb cleaner.
#282 of 486 Re: starting problems 97 blazer [spck68]
Jul 14, 2009 (9:23 pm)
I agree with the other post either the spider or the fuelpressure regulator. Its not a hard job to do only took me 45 minutes, just make sure the bolts go back into the right location.
Jul 26, 2009 (7:25 pm)
I have a 2002 blazer that will not start. It will turn over but not start up. I am getting a fuel pressure of 45, i do not know what it should be at. I am thinking my fuel pump is bad. I replaced one about 3 years ago. Anyone have a suggestion?