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98 Chevrolet Blazer V6 help please

Tiny
KEEBLER89
  • MEMBER
  • 1989 CHEVROLET BLAZER
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
What would cause my truck to have a long turnover start, a really rough idle, and a loss of power after idling at a stop light for about a minute?

This problem gets worse as the truck warms up. It feels as if i'm not getting power from all 6 cylinders but this goes away after about 20 feet of acceleration. The truck has never not started. It just has to turn over for about 5 to 10 seconds before it fires up. I changed the spark plugs and wires thinking it was that and then I tried the fuel filter and it wasn't that either. Has anyone else had this problem?
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Monday, February 8th, 2016 AT 12:50 PM

26 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
The distributor cap and rotor are known to get very corroded on these engines a bit since they sit on the back and top of the engine. Remove the cap and look inside it for corrosion on the terminals and on the rotor. If good then check for vacuum leaks. Follow all the lines as they too are VERY prone to cracking and braking. Get a can of throttle body cleaner to spray around for leaks. If the idle changes then you know you found a leak. Check fuel pressure with a gauge.
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Monday, February 8th, 2016 AT 1:39 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Ok so I changed the distributor cap nd rotor and the problem got ALOT better. But it still doesnt run perfectly. Do you think that it just might take a minute for it clean off the ends of the park plugs and then it will run better? I couldnt find and or hear any leaks but the distributor cap and rotor were absolutely worn out
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Tuesday, February 9th, 2016 AT 1:29 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Check your spark plugs to be sure they aren't fouled out.
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Tuesday, February 9th, 2016 AT 1:31 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Ok I will, and the check engine light just came on too so ill get back to you on the error code
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Tuesday, February 9th, 2016 AT 2:28 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Ok
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Tuesday, February 9th, 2016 AT 2:30 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Just got the light checked and it is P0300. The spark plugs look good
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Wednesday, February 10th, 2016 AT 2:37 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Ok, P0300 is random/multiple misfire. Check fuel pressure.
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Wednesday, February 10th, 2016 AT 2:44 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
I was told by a buddy of mine that he is almost certain that this is the spider injectors failing. Does this sound about right? Im hoping its not because they are pretty expensive
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Wednesday, February 10th, 2016 AT 3:14 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Yes, that's why I want you to do a fuel pressure test.
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Wednesday, February 10th, 2016 AT 3:28 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Ok it might take a few days I have to find a gauge. But ill get back to you
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Wednesday, February 10th, 2016 AT 3:47 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Rent one at the parts store
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Wednesday, February 10th, 2016 AT 3:47 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Thats what I was planning on doing but I have 12 hour days at school tomorrow so the earliest I can get under the hood again
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Wednesday, February 10th, 2016 AT 3:48 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Ok so I finally got in to test the fuel pressure and it is sitting at about 55 at idle and it jumps to 58ish with an engine rev.
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Saturday, February 13th, 2016 AT 10:35 AM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Ok, test the pressure with the key engine off. Watch the pressure to see if it goes up, start to slowly go down after a minute or two.
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Saturday, February 13th, 2016 AT 11:22 AM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
As soon as I turn the key it goes to 60+ but it rapidly falls and hits 0 before a minute
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Saturday, February 13th, 2016 AT 11:59 AM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
That is a bad sign then. It should hold pressure.
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Saturday, February 13th, 2016 AT 12:04 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
Could the fuel pressure regulator on the back of the spider injector be the culprit?
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Saturday, February 13th, 2016 AT 12:34 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
Typically is the poppet valves on the injectors on the spider Junction
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Saturday, February 13th, 2016 AT 12:42 PM
Tiny
KEEBLER89
  • MEMBER
  • 14 POSTS
So what needs to be changed the fuel pump or the injector? If the poppet is stuck open would that make me loose pressure? The way that I am
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Saturday, February 13th, 2016 AT 12:47 PM
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
It could be the regulator as well. Here is a link that will help you better to figure it out. This way you don't have to wait for my replies lol. http://troubleshootmyvehicle.com/gm/4.3L-5.0L-5.7L/testing-the-spider-fuel-injector-2
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Saturday, February 13th, 2016 AT 1:30 PM

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