Question about 1999 Isuzu Rodeo

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Idle is erratic

When in park or neutral the idle will rev to about 3000rpm and then suddenly go down to where it should be before revving up again. It generally stays around 2500-3000 and is consistently high when in gear as well. I took it to a shop and they said a sensor was detecting that the carb was running lean, so that was affecting the problem. they cleaned the sensor, which is a unit btw the air filter and the carb (??) (i know nothing) which seemed to fix the problem for about a week but now it's back. any other suggestions?
thx
adam

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  • Anonymous Apr 29, 2009

    extreme high idle in park and neutral -- about 2200 rpm- when put in drive or reverse idle is still too high at 1200 rpm - vehicle will actually itself at 40 mph - I have had sensor replaced and computer box replaced but when put on diagnostic machine it is still too high * can you identify? Please help

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I had the same trouble 2 to 3000 rpms. there is a power steering stwich on the bottom of steering pump unplug this and see if your rpms come down. Mine did,you can get a new stwich from rockauto.com for about 60.00. It took me four months and 400.00 to find this out

Posted on May 02, 2009

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If there is an idle air motor you may need a new one of those that might be the "sensor" that they were talking about

Posted on Nov 12, 2008

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