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Chevy Blazer Starting and Stalling Problems



  • ok i have a 96 chevy blazer i have replaced spark plugs and wires,the egr valve,new fuel pump,and fuel filter,new air filter,rotary cap and button ,a sensor or something thats underneath the rotary cap and buton,the pcv valve, ive ran dry gas threw it an fuel injection cleaner an everything i can think of the check engine light is not on ...ok if im jus driving regular the truck misses very very bad if i get on it it will miss at first then smooth out an occasonily miss an as soon as i slow down it will start missing real bad again the motor isnt making any weird noises or anything an ive also checked for vacum leaks an cant find any please if you no wats wrong help me i would greatly appreciate it!!!!!!!!!!thanks
  • gg1328gg1328 Posts: 16
    Hi, it's me again. I looked for the Crankshaft Position Sensor this morning, and I couldn't find it. I took off some kind of mat that was bolted to the bottom so i could have a better and closer look. I looked hi and low all around near the bottom pulley at the 7 o'clock position. I thought maybe it broke off and i would see wires hanging. Nope. No wires either. Can you please still assist me further. Might it be in some other location?

    Thanks again,
  • Hi. I wish I could help you...because I have almost the exact same problem!! Same year and done almost all the same things!!! I do notice that mine is worse if I drive in OD. If I am in's a little better. So I am with you on looking for an answer!! It's driving me crazy!!

    Good Luck!
  • a buddy of mine owns a garage an he checked it out for me he said he had a blazer come in same year an everything doing the same thing he said it was the injectors wich on this year modle is the spider injectors he said theyre bad for cracking on the hoses coming off the injectors (the part that looks like legs off a spider) i have had several people tell me the same thing so i have ordered one an when i put it on.... if it fixes the prob. i will deff. let ya no
  • 1996 chevy blazer..
    Engine turns over but won't start..I'm not to much of a mech..But I can swap parts if I know the right direction to go..
    Dies this sound like a fuel pump or filter issue? I don't have anyway to test fuel pressure..But if swapping a fuel filter can save me from spending bigger bucks to swap a fuel pump, I will..Or am I looking in the wrong place?
  • My blazer is definitely doing the same exact thing right now. Well what happened was it was doing the same exact thing and then after about a week of that it started actually missing while i was driving a steady speed where as originally it only did it when i was idling or coming to a stop. Then about a day after it started doing that it just shut off, and then it wouldn't turn back over, it just cranked and wouldn't fire. I replaced the spider injector and it ran wonderfully for about a week, then i got out of work one day and it wouldn't start, the fuel pump went. I replaced the fuel pump and its been about a week now and just yesterday it started up with what it was originally doing again, where if im not driving at a steady speed it wants to die, so i guess the fuel injector was not the problem in this case although maybe it is in yours i don't know. i don't know if im caught in a continual circle of part replacement or what, but if anyone has nailed down the exact thing that causes this i would greatly appreciate it if you would let me know before it dies completely on me again : )
  • I thought putting in a new Fuel sensor would fix the problem but still won't start. Could it be the emissions? How would I get that checked? could I do it at home? I have a 2003 Blazer. Drove it home one day and it just shut down, like no fuel was getting to the engine. Niw it won't start at all. Was there a recall on this in 04 and 05? Please reply, Thank you v_bunnies1010
  • duntovduntov Posts: 133
    That could be a cheap item to fix or it could be very expensive. Always start with the cheapest item first. Start by checking the fuel pressure, if any.
    The fuel pressure should be 62 lb. start and 54 lb. running. If there is no pressure or low pressure, it could be :
    Fuel pump relay, AC Delco 1550688....$10.11
    Fuel filter, AC Delco GF845 ...$13.59
    Fuel injection regulator kit, AC Delco 217-3074....$56.87
    Fuel pump module kit, AC Delco, 4-door, MU 1064...$372.79
  • I would think that your fuel pressure regulator is bad, did you replace that too? also mybe the crankshaft position sensor.
  • I have a 97 Chevy Blazer and i replaced the starter about 4 months ago. The car started fine for a while but now its making a grinding noise when i try to start it i had the starter tested and it was fine i replaced the battery and still have a problem.Also this truck had a tune up and it is still missing when i drive dont know what to do anyone have a suggestion i am frustrated.
  • tidestertidester Posts: 10,059
    Did your mechanic check the starter gears?

    tidester, host
    SUVs and Smart Shopper
  • No i have not yet but plan on doing that today,Also after i had the truck tuned up i changed the plugs and the wires it ran like new but only a week latter it started missing again,I am afraid the transmission may be going out what else could it be i know i have fluid.Would a diagnostic test tell me if the transmission is going?Thank you for your time and your help it is appreciated so much.
  • tidestertidester Posts: 10,059
    Would a diagnostic test tell me if the transmission is going?

    That wouldn't hurt but I don't think the transmission would have any effect on starting the truck based on the symptoms you described.

    tidester, host
    SUVs and Smart Shopper
  • I have a 99 s-10 blazer 4.3L. It recently wouldn't trend no problems..........i stopped at my kid's school and when i came out it tried to start for a second and died. After that it turns over but makes no attempt to actually start. I have an existing problem i believe to be with the fuel sending unit......the gas guage doesn't work (anything less than a full tank the gas meter flucuates and doesn't go less than half a tank ever.) The gas guage problem has been like that for about 5 years. When I turn the key on, and when i try to crank it there is no "whirring sound" associated with the fuel pump running.....i swapped the fuel pump relay with the ac one (same part no.) luck.....i can feel the relay picking up when you turn the key on...I changed the fuel filter today....but i have to charge the battery back up to retest, however when i went to depresurize the fuel lines i found no pressure at the gauge connection or at the fuel filter (which did seem very tough to blow through). If there was pressure on the supply side of the filter i would think the pump wasn't running based on pressure already locked on that side of the system....any suggestions?
  • I'm trying to find the oil pressure and relay bypass wire/connector for the fuel pump that is mentioned in the haynes manual. Additionally i'm trying to check for voltage at the fuel pump at the top of the tank.....i can only get to one connection on the tank but i believe its for something else......maybe a pressure sensor or something. I've been judging tank level by miles driven....and initially thought i had run out of gas about 50 miles earlier than i should have....I'm not sure if it was really out of gas. I put 4 gallons in to try to start it....but have run down the battery trying...along with testing.......any help would be appreciated. I plan on checking spark plug wires for spark and then dropping the fuel tank to check for voltage at the pump....(cont'd from post 238)
  • jlflemmonsjlflemmons Posts: 2,242
    Don't laugh. Take your foot and kick the bottom of the fuel tank, hard. Maybe a couple of times. Then see if it starts. You wouldn't believe how many times this works. If it does, there is a new fuel pump in your future.
  • alright......I'm getting spark to the plugs....put in new plugs just cause they were due.......replaced the fuel pump/fuel sending unit....Gas guage works now......still no fuel pump running. Still don't know where the oil pressure bypass connector is. Question: How do i check the crank position sensor (i see the connection) and would it cause the pump not to start at all. After I changed the connector associated with the fuel pump i realized I didn't have small enough leads to fit into the connector to check for voltage..missed opportunity. The old fuel pump was burned up (<1 ohm, new pump is 28 ohms), and fuel level sender was bad (works now). Can anyone help me further??
  • I NEED HELP!!!! I Have a chevy k5 Blazer And Well To Be Honest It Gots Alot Of Problems But Its A Beast And Runns On My Way Up To School One Dat It Keep Shuting Off And Not Ideling Now It Wont Even Start At All At First I Checked The Starter to See If It Got Backed Up Or Something Thats Not The Problem Could It Be The Ingnition Wires? Wat Do I Do To Fix This? It Wont Even Turn Over Would I Have To Replace The Wiring Harness? Could I Have Fryed it Turning It On and off So Much?
  • I also had the same problem on the same type of vehicle once. I did evrything you mentioned (tune-up, sensors, etc) and it acted fine for awhile and then it would start to fart around. The response was delayed and it seemed plugged. I changed my EGR valve which is underneath your air intake and above your engine coolant hose (on the 4.3 L only). That worked so well that I don't get any backfiring or nonsense.

    When I was trying to accelerate on the freeway attempting to pass another car, my RPM needle would jump and then lag back down, then I'd have push the pedal all the way down to get enugh response to pass. Try the EGR valve and get a gasket with the filtering screen on it. This way if you have tons of carbon in your manifold the EGR valve wont get clogged. If you cant afford to buy a new EGR, then try cleaning it but if it's busted, just change it and save yourself some time.

    If this doesn't work, get rid of it. :)
  • Hi my Blazer will only turn over if it has been boosted or sat on a charger for several hours...if you turn it off it wont turn over again even if you try as soon as you turn it off. It has a new battery, its been in the shop for always blowing fuses and starting issues (it use to hold a charge once boosted) due to a burnt out bulb under the hood. That burnt bulb cost me enough, If someone has an idea what could be my problem please any suggestions welcome.
  • duntovduntov Posts: 133
    All S10 Blazers have a small amount of parasitic battery drain when the cars is just sitting without the engine running unless you disconect a battery cable. That is because the ECM, clock, sensors, theft alarms, and relays stay energized all the time. However, due to the blown fuses you have had, it is quite obvious that your car has overloads or shorts in the wiring that is increasing the battery drain, at least until a fuse blows. A bad relay will not cause a fuse to blow but it will cause a increase in battery drain. A bad relay is just like a short but is not solid enough to blow a fuse. Make sure all your accessories are working.

    For example, a bad power door lock relay on my 1991 S10 Blazer caused a 8 month old Autolite battery to go completely dead after the car sat for a week without being started and driven. Once a battery goes completely dead it will not take a full charge and should be replaced. I replaced the power door lock relay with a new one from NAPA and I also replaced the dead Autolite battery with a AC Delco 60 month battery. Now the Blazer has no electrical problems.

    I also purchased a Beltran 800 ma Battery Tender to connect to the battery in case my Blazer sits again for an extended period without being driven.. If you have a parasitic battery drain of less than 800 ma, the Beltran 800 ma battery tender will keep the battery fully charged no matter how long it sits without being driven. Normal parasitic battery drain is usually no more than 10 ma on a S10 Blazer. A good multimeter can tell you exactly how much parasitic battery drain you car has.
  • Thank-you for all your suggestions. I also have issues with my power door locks were is the relay for the door lock. You have definitely have helped narrowed the list down. Thanks again
  • We were driving for about 20 min and then it died so we pulled over tried to start it and it wouldnt start. it then started shaking and backfiring. We recently replaced the fuel pump and gas tank. Anybody have an idea as to why it's not starting?
  • jlflemmonsjlflemmons Posts: 2,242
    Check engine light?

    Several things could cause this, a MAP sensor being one of them. Generally speaking, the vehicle has suffered a hard failure and if it is sensor related you should have a code stored.

    Other concerns would be jumped timing from a worn timing chain/gear set. Also an ignition issue from the distributor.
  • check engine light is not on. i bought the motor brand new 3 years ago it only has 40,000 miles on it. like i said no warning at all no check engine light just died. i just replaced fuel pump and i just double checked my pressure its good (60 psi)
  • jlflemmonsjlflemmons Posts: 2,242
    You may have a code set anyway. The symptom described can be a number of things, and I don't want to send you down the road of parts swapping. Did the new engine come with a distributor, or did you pull the one from the old engine? If from the old, was the rotor and cap changed? A MAP sensor will do this also where all is good and suddenly every thing goes nuts because of a bad input to the computer causes fuel mix to go way off, ignition timing, all sorts of problems. But a number of other sensors can also cause similar issues, like the crank position sensor.

    These things aren't cheap. See if you can find a buddy with an OBDII scan tool. Autozone will check it for you, but the car has to be at their store and it sounds like that isn't going to happen!
  • ok so check this out.. I got a 97 blazer 4x4, and last week i did plugs/wire, fuel filter, and cleaned the cap an rotor cause i replaced em last year. i drove the truck after and it was solid, my dad drives it and about 3 miles from my house the truck backfires and and shuts off... wont start again. so we didnt hear the fuel pump turning on so i dropped the tank and replaced that and the tank breather that broke the first time we replaced the fuel pump, and now the truck has plugs,wires,fuel filter, and fuel pump and still wont start!! i know its not the coil cause that shocked the hell out of me.. can someone pleaseeee help me out im struggling to keep my sanity!
  • I've had a similar problem with my 1997 Blazer (Vortec V6). My problem was that some of the electrical components would work... windows, lights, radio, etc would work and would crank, but not start. But, if I flicked the key on/off enough times the gauges would all light up and I could hear the fuel pump buzz - and the Blazer would start fine. Sometimes it would work sometimes it wouldn't. Very annoying, very frustrating.
    My problem - the Turn Signal arm. There are a bunch of connections on the backside of the arm - if you don't pull it straight out when removing it the horn will honk, etc.... Seemed silly that they wouldn't insulate them more. So, I put some electric tape on the steering column and Dielectric Compound on the connections. Put the key in and it started fine. Turned it off and on a couple dozen times and worked every time. I haven't had the problem since. This was 4 months ago.
  • It sounds like the ignition is bad. I would try that. Or a bad fuel pump relay.
  • LOL - read my message!
    I fixed my problem.
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