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Old 03-24-2003, 09:53 AM
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Post Blazer S10 4.3 idles poorly

My son and I recently rebuilt the engine (4.3L EFI) in his 1989 Chev S10 Blazer. The rebuild went great, we reinstalled the engine and it cranked immediately and runs strong. The problem...sometimes (often) when it's idling, it will just idle slower and slower until it quits. It will restart quickly and idle great for about 30-45 seconds, then start slowing down again. There are no engine lights illuminated and it just passed our states emission control test with flying colors, even though it had to be restarted 2 times. I might add that there is no "missing" while it does this, it just smoothly...quits! Another website said it could be the Throttle Position sensor but before I replace that I wanted to see if any other 4.3 people had experienced a similar problem. Any ideas?

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Old 03-30-2003, 08:38 AM
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I am having troubles with my 92 Jimmy with a 4.3

One of the problems that you might check is your fuel pressure. I was told by a tech at a local garage that they must maintain around 60 lbs of pressure to run right. When it fluctuates under that amount it effects how it runs big time. And a plugged or partially plugged fuel filter can cause problems. Sometimes it will cause them to simply die very smoothly, like when they run out of fuel.

So I replaced the fuel filter and filter. Now my problem is hard starting. It cranks for several seconds before firing up even though the fuel is being delivered as needed and the ignition and motor checks out on the diagnostic computer.

ARGGGHHHH! <img src="graemlins/crash.gif" border="0" alt="[crash]" />
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