Question about 1999 Isuzu Rodeo

2 Answers

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?

Posted by on

  • 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



2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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 for about 60.00. It took me four months and 400.00 to find this out

Posted on May 02, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert that hasĀ over 500 points.


    An expert who has answered 200 questions.

  • Expert
  • 275 Answers

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


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Engine revs up down while in idle

If its been without the line for over a year, I Highly doubt it. Look into IAC valve. Most are installed with 2 screws, easy to adjust. Idle Air Control Valve. Look that up, for a start.

Apr 15, 2014 | Toyota Matrix Cars & Trucks

1 Answer

What causes erratic idling on a peugeot 107

i had the same problem with my pevgeot. its the rev counter getting stuck on and/or sticking xx

Mar 14, 2013 | Peugeot Cars & Trucks

1 Answer

1998 Nissan 200sx won't rev past 4000 RPM in neutral. What's the cause?

STOP doing that, forget about it, your going to blow your engine !

Mar 06, 2013 | 1998 Nissan 200SX

2 Answers

Dodge charger revs up and down when at a traffic light

Any codes ? Surging idle or erratic just a lil more info ?

Jan 06, 2018 | Cars & Trucks

2 Answers

I have replaced idle control valve and car is still over revving,its a 1999 peugeot 206 1.1, mostly sits at 3000rpm but is quite erratic, help plz

Check the fuel pressure regulator for to much pressure.Pull the vacuum hose off the map sensor and if fuel runs out then replace the regulator.

Oct 13, 2012 | 1999 Peugeot 206

1 Answer

Car drops out at 2700 rpm and sputters

There is a rev limiter in these cars that disallows over revving in park or neutral. Does it climb past 2700 under hard acceleration?

Jun 01, 2009 | 1990 Ford Thunderbird

4 Answers

Ford focus 2000 1:8cc

check for a vaccum hose that broke or came off

Jun 25, 2008 | 2000 Ford Focus

Not finding what you are looking for?
1999 Isuzu Rodeo Logo

Related Topics:

510 people viewed this question

Ask a Question

Usually answered in minutes!

Top Isuzu Experts


Level 3 Expert

79865 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14411 Answers

Are you an Isuzu Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides