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Old 08-03-2013, 04:58 PM   #16
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99 blazer help


Nope nothing worked even changed out some lines, changed PVC valve and plugs are good, don't know now!!!

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Old 08-03-2013, 06:06 PM   #17
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Does your car have the 4.3L v6?

I am sure you would have stated this.....

Are there any 'check engine' or 'service' codes showing up? Are you getting good fuel pressure?

Have you given the intake / throttle body a good cleaning lately? It could be something with the fuel injectors getting clogged.

I dealt with an EFI saturn that had a bad idle mixture. It was causing a very high idle but that may be worth checking. I think it was called a IACV on the saturns (GM product) (longshot)

I know a compression test is not easy for most DIYers, but that will let you know if you are getting good compression on all cylinders.
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Old 08-05-2013, 05:10 PM   #18
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Just found out, no compression on 5 and 6 I am thinking the valves went, bad news need another engine...,.
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Old 08-05-2013, 05:34 PM   #19
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99 blazer help


Check whether fuel is getting to the dead cylinders.
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Old 08-05-2013, 07:10 PM   #20
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Quote:
Originally Posted by bostonwindows30 View Post
Just found out, no compression on 5 and 6 I am thinking the valves went, bad news need another engine...,.
Could be a blown head gasket. can you see if there is a lot of sludge built up inside valve covers? Sometimes the pushrods can get so gummed they can't move fast enough and get bounced off the rocker arms. FYI from my Army training a fuel system has only five "circuits", high, low, pump, float, choke. Even all the new sensors control one of these circuits. They are all controlled within the computer instead of individually, but if you know how each sensor is linked, you can narrow down a problem.
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Old 08-05-2013, 07:17 PM   #21
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Check fuel psi to see if it holds psi. The regulator is under the upper intake and are common to leak and flood out the back cylinders. The rings may just be washed out from gas. Compression will usually come back if you put a little oil down the plug hole after you fix the fuel leak.
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Old 08-05-2013, 07:28 PM   #22
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I don't see no fuel leak
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Old 08-05-2013, 07:29 PM   #23
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Just put regular oil down in the hole???
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Old 08-05-2013, 09:03 PM   #24
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It will be an internal leak you won't be able to see it. That's why you need a fuel psi gauge and see if it holds psi. And yes regular oil you don't need much. Put a little down the plug hole and the crank it over before installing the plug.
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Old 08-05-2013, 09:06 PM   #25
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Okay will do thanks..
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Old 08-05-2013, 10:13 PM   #26
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I don't think you confirmed engine type. If you have the 4.3L v6, GM had a serious issue with their 98-2000 Fuel injection systems. It was like a "spider" system that actual dripped fuel into the intake runners. They were chronically bad and GM even offered a retro-fit kit to correct the problem.

Not sure if this is your problem, but your symtoms sound a lot like the issue I had with my 2000 Express van that had the 4.3L v6.
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Old 08-06-2013, 03:49 AM   #27
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Yes it is the same engine, so what should I do??
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Old 08-06-2013, 06:54 AM   #28
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Star with testing fuel psi
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Old 08-06-2013, 09:07 AM   #29
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Originally Posted by bostonwindows30 View Post
Yes it is the same engine, so what should I do??
Checking the Fuel PSI is a good start. Also start reading up on GM's Pre 2000 fuel injection issue. I paid a shop to repair the 4.3 that was in my full size van, but yours should be much easier to work on in a blazer.

I memory is correct, NAPA sold the kit, but it was a bit pricey. ($350 range, from memory). This was a common problem. Check to make sure your car was not already upgraded by a prior owner (probably not). If your on a tight budget, you might even try searching the junk yards for 97-00 GMs with the same 4.3. Many cars were retro-fitted by GM under warranty, and you might just find what you need, and get it dirt cheap. **you have to know what your looking for**

I will try to post a link if I can find it.

*~*~*~*~*~*

Here is a good link with some information and pics of the conversion. They sell the conversion, but it seems a bit pricey to me. Check around on the net. Rock Auto, NAPA etc. (make sure this is your problem before shelling out the $$)

http://www.theautoshop.net/VortecMPFI.htm

Last edited by caveeagle; 08-06-2013 at 09:21 AM.
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Old 08-06-2013, 09:32 AM   #30
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Here is another site with better pictures and a better price for the upgrade kit. (FYI)

http://www.fuelinjector.citymaker.co...onversion.html

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