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Chevrolet Blazer, GMC Jimmy, SUV
#211 of 496 95 Blazer is missing badly...HELP!
Oct 01, 2008 (12:22 pm)
I have a 1995 Chevy Blazer LS, 4.3, automatic. It had a bad miss in it so I done the typical tune up (plugs, plug wire, air filter, fuel filter, oil change, oil filter). It took some of the miss out for about 3 weeks, now it's back to missing even worse now, so I dropped the gas tank and cleaned it out, put another fuel filter on it (cause when I replaced the first one it was really bad). I know the fuel pump is good and I know its getting fuel. I have replaced the relays so I know they are not the problem. Sometimes it starts very easy, sometimes it don't...sometimes it runs great, sometimes it don't. It has never completely died on me (yet) but it misses but not all the time. You can drive for a few miles and it runs great then it will start jumping and missing. If anyone has any suggestions.. ..that would be great...thank you!!
#212 of 496 Re: 95 Blazer is missing badly...HELP! [redneckgirl]
Oct 02, 2008 (7:28 am)
Is this a backfiring (ignition) or stalling (fuel system) type of "miss"? And when does it do this? Does it happen mostly at idle, at highway speed, when the engine is just started, when fully warmed up, just when it's raining? Can you give more info? And have you had the fuel pressure actually measured?
#213 of 496 Re: 95 Blazer is missing badly...HELP! [mwolf9000]
Oct 02, 2008 (8:00 am)
It is not backfiring, it has only completely stalled on me once, but fired right back up. It misses at various times, sometimes when your at idle sometimes when you running 40 to 50mph. I have noticed it does it more when it is warm but it also sometimes misses when you just start it. It does not miss all the time. I have not had the fuel pressure measured. Sometimes you can drive for 4 or 5 miles before it starts missing then you give it a little more gas and it quits missing for a bit. I took it to a garage today and explained to them what was happening and told them everything I have already done and they were also stumped. The guy at the garage (which didn't seem to know what he was talking about) said the catalytic converter may be plugged up, but from my experience, when a converter plugs up and you give it gas, the miss gets worse, so I really don't think thats the problem.
#214 of 496 Re: 95 Blazer is missing badly...HELP! [redneckgirl]
Oct 02, 2008 (6:01 pm)
Check fuel pressure and if it looses pressure change the fuel pressure regulator. I would also clean the spider assembly while all of the components are taken apart.
#215 of 496 Re: 95 Blazer is missing badly...HELP! [redneckgirl]
Oct 03, 2008 (5:09 am)
Are you getting a Check Engine light? There are any number of sensors that can cause the ignition to go intermittent and misfire.
In my history, there have been two occasions of an intermittent crankshaft position sensor, but at $60, you don't want to swap this one unless you know it is bad. Stores a code, but I can't remember off the top of my head what it was. And if the lamp doesn't come on, the code won't be there anyway.
#216 of 496 catalytic converter 97 chevy blazer ls 4door 4wd
Oct 11, 2008 (1:48 pm)
What are the signs of a catalytic converter plugging and backfire sound from the cat...? Fuel filter changed, new fuel pump, 02 sensors before cat has been changed. po131 and po151 came-up before the changes. No rotting egg smell.
#218 of 496 94 BRAVADA WON'T START
Oct 20, 2008 (10:28 am)
I have a 1994 Bravada 4.3 CPI Engine - Vin W, 135,000 miles on it. I own the car about 4 and a half years and is used mainly as a 2nd car and in winters. (4 wheel drive vehicle)
THE CAR WON'T START, I CHANGED ALMOST EVERYTHING. THE ONLY THING LEFT IS THE CRANKSHAFT POSITION SENSOR. I WAS TOLD IN QUESTION 182 THAT IT CAN BE FOUND FROM UNDERNEATH THE FRONT PUMPER AT THE 7'OCLOCK POSITION. I SEARCHED HIGH AND LOW, AND I STILL CAN'T FIND IT.
CAN ANYONE PLEASE HELP ME WITH FURTHER DETAILS? I'M GOING NUTS TRYING TO LOCATE IT. MY INSPECTION IS DO NEXT MONTH, AND I'M HOPING TO GET IT GOING BY THEN. MY ORIGINAL QUESTION WAS 181. I ALSO SMELL GAS WHEN I CHECK MY OIL. CAN ANYONE PLEASE TELL ME WHAT THIS MEANS ALSO?
#219 of 496 Re: 94 BRAVADA WON'T START [gg1328]
Oct 20, 2008 (2:15 pm)
sounds like a leaking central port injection unit is it tbi or carb if it is tbi could be leaking on top of plenum which would cause fuel smell in the oil. I think this is the year that has the fuel regulator problems on the cpi or the fuel lines running through the plenum, but i wouldn't start it with plenum off but i would turn the key on so the fuel pump runs so you can look for a leak. They sell fuel a regulator repair kit and gm sells fuel line repair kit. One way to test it might be to put a fuel pressure guage on it turn the key its supposed to hold around 50-60 psi for 2 min if it bleeds off you know you have a leak. Also if you do have a leak it should be very noticable when you take off upper plenum should be black if there is clean brown tint spots sign of where your fuel is leaking. I have a 98 blazer thats how i know this stuff its having starting probs need to replace ignition control module, or distributer cap
#220 of 496 Re: 94 BRAVADA WON'T START [mchituck]
Oct 20, 2008 (3:24 pm)
Thanks for your quick reply. I'm trying to locate the CRANKSHAFT POSITION SENSOR. If you could please be specific about its location. Thanks.