1998 Chevy Silverado 1500 Rev high smoking

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tnb
Posts: 1
Joined: Thu Dec 04, 2014 9:34 pm

1998 Chevy Silverado 1500 Rev high smoking

Unread post by tnb » Thu Dec 04, 2014 9:40 pm

I went to crank my truck and it reved up high the rpm went up to 4,000 then shut off and started smoking. I have replaced my IAC valve TPS sensor cleaned the throttle body and cleaned the massive air flow. Need helping trying to figure out what is causing the truck to rev up high and then shut right back off

Thanks


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carriedi
Posts: 2266
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: 1998 Chevy Silverado 1500 Rev high smoking

Unread post by carriedi » Thu Dec 04, 2014 11:06 pm

you should hook up a scanner and look at the data stream before you start it up. Then look at it and if you can record the data stream so you can see what is happening to the engine. A large vacuum leak?

you already spent money on parts that didn't fix it, before you buy more parts find out what is going on. Is the IAC reading too high? Is the exhaust showing too lean? TPS reading within spec? You can see so much in the numbers
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