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Old 04-22-2008, 08:15 PM
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gmc sonoma 4.3 whoas

the engine in my truck when put in drive idles up from 600 to 1000 but when shifted back to nutral it returns back to 600 any ideas

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Old 04-23-2008, 09:01 AM
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Year?
Miles?
When did it start having this problem?

Can you hear a vaccume leak? (hiss)

Need a little more info... thanks!
~Scott
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Old 04-23-2008, 12:48 PM
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Quote:
Originally Posted by UR50SLO
Year?
Miles?
When did it start having this problem?

Can you hear a vaccume leak? (hiss)

Need a little more info... thanks!
~Scott
sorry the year is 2000 it has 190,000 miles on it have not been able to hear any vacume leaks dont know what else to add but am willing to answer any questiions .. somebody might ask something i am not thinking about
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Old 04-23-2008, 03:34 PM
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Might be the spider injector.

Can you tell if it's "missing" on a cyl?

Running rich... hard starting? stuff like that are symptoms of the spider injector or fuel pressure regulator.

Is it throwing any codes? (check engine light)?

The intake gaskets are also prone to leak as well. (on your mileage) unless they have been replaced.

There are several several service bullitens on the spider injector.

That's why I switched to the Marine intake manifold .. But I turbo charged ours and needed more fuel anyway

I'll check back later for more info.
~Scott
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Old 04-23-2008, 06:54 PM
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4.3

yes it misses on 3 and 4 everynow and again will check gaskets this weekend
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