2004 Blazer Turns over but won't start!

10

Asked by Jul 15, 2015 at 11:03 PM about the 2004 Chevrolet Blazer 4 Door LS 4WD

Question type: Maintenance & Repair

Eliminated electrical problem...tested fuel pump, it works....changed fuel filter...getting a
P0102 code....cleaned MAF and air filter.  Unplugged MAF and still won't start!  Sprayed
throttle body cleaner into throttle body and it started for about 3 seconds and quit!  What
is going on?

3 Answers

56,575

It's a fuel system problem. Since it ran on the throttle body cleaner you have spark. The MAF code P0102 will not prevent it from starting. Check for fuel pressure and that the injectors are spraying. HTH. -Jim

2 out of 2 people think this is helpful.
10

Thanks, Jim! I discovered today that there was another code for the MAP sensor. Fuel pressure is fine, so I guess all that's left is the injectors, huh? Thing is, after I put the MAP sensor in it will sometimes start and run for 20 seconds and then die. If I try to hit the accelerator, it dies immediately! WTH????

1 out of 1 people think this is helpful.
56,575

You're welcome. Glad to help. Definitely check the pressure at the fuel rail and for injector spray. Sounds like you're getting a little bit of fuel and when you open the throttle it kills it. Check the resistance value of the throttle position sensor. If the computer "thinks" the throttle is being held wide open while cranking it will go into clear flood mode. In clear flood mode the fuel delivery is dramatically less than normal. This is to help get you started if the engine somehow gets flooded with gasoline. In fact, you can try holding the accelerator pedal to the floor and crank it. See what happens. HTH. -Jim

Your Answer

Add photo

Related Questions

  • 2004Blazer sometimes when I try to start car it won't turn over but battery is good 1 answer

    2004 Blazer sometimes when I try to start car it won't turn over but battery is good it does heavy clicking when I put on battery jump it starts every time

    2004 Chevrolet Blazer 4 Door LS 4WD

    -

    Maintenance & Repair

  • 96 blazer won't start 2 answers

    96 blazer 4.3 won't start. Changed distributor. Quad checked tdc. Oil smelled like gas. Drained that out. Turns over just won't start

    1996 Chevrolet Blazer 4 Door

    -

    Maintenance & Repair

  • 95 blazer won't start 1 answer

    95 blazer won't start. Ran out of gas put gas and new fuel filter it turns but doesn't start. What could it be

    1995 Chevrolet Blazer 4 Door LS

    -

    Maintenance & Repair

  • Won't start 1 answer

    My Chevy blazer won't turn over what is the problem

    2003 Chevrolet Blazer

    -

    Maintenance & Repair

  • 97 blazer key won't turn 2 answers

    I have a 97 blazer and my key has always been. Little bent I have tried to have a duplicate made several times but (not from locksmith or dealership) the new key will unlock my doors but won't start...

    1997 Chevrolet Blazer 4 Door LT 4WD

    -

    Maintenance & Repair

Blazer

Looking for a Used Blazer in your area?

CarGurus has 1,364 nationwide Blazer listings starting at $1,295.

ZIP:

Search Chevrolet Blazer Questions

Chevrolet Blazer Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,700
#2 yetilikesbeer
yetilikesbeer
Reputation 1,060
#3 dandyoun
dandyoun
Reputation 650
View All

Related Models For Sale

Used Chevrolet TrailBlazer
123 Great Deals out of 5,375 listings starting at $650
Used Chevrolet Tahoe
1,067 Great Deals out of 32,279 listings starting at $1,495
Used Chevrolet S-10
9 Great Deals out of 1,636 listings starting at $2,450
Used Chevrolet Silverado 1500
2,622 Great Deals out of 148,531 listings starting at $1,800
Used GMC Jimmy
308 listings starting at $2,750
Used Ford Explorer
1,427 Great Deals out of 71,887 listings starting at $985
Used Jeep Grand Cherokee
1,116 Great Deals out of 69,510 listings starting at $1,500
Used Ford F-150
3,391 Great Deals out of 203,570 listings starting at $1,273
Used Chevrolet Suburban
715 Great Deals out of 21,977 listings starting at $2,100
Used Toyota 4Runner
380 Great Deals out of 20,140 listings starting at $2,499
Used Chevrolet Colorado
320 Great Deals out of 17,033 listings starting at $2,295
Used Chevrolet Impala
950 Great Deals out of 36,331 listings starting at $884