Rodeo Running Funny

The marvellous thing about internet auction sites is that, having listed the vehicle, a few days later someone shows up with some money and takes the problem away.

It seems to me you have a bad connection.....use an ohmmeter and wiggle the wires around to see if you can find the problem....otherwise, or in addition to, clean all connections, use a small amount of conductive grease on the connections....remember the wire itself could be bad....

Solar Eagle

I took readings under the vehicle at the O2 sensor and found them to be in line with the factory spec's... However I forgot the simple things and will be under the vehicle again this week end. The intermittent wire break may have bit me. seeing only 1 bank of cylinders is affected your statement of a broken wire comes to light. I may have seen good numbers being in one position however when installed up in the vehicle that may change. I will get some more readings and report back Monday.

Thank you very much for your positive input. I plan on seeing this problem through to the end to learn from it !

3 other mechanics have toyed with the truck in the time they could and 2 corporate type shops, and the dealer who told me the truck checks out fine. But the surging says differently. Again thanks.

These type of problems can be time consuming and tricky to find....that's why the "all of the above" position is usually taken, and all wiring is replaced... I would go through and clean all the connections and use a little conductive grease on each connection, and if that didn't get it then one wire at a time...Living on the beach here with high humidity conditions, the conductive grease has become my 'go to' solution for everything electrical....add to that the electrical components nowadays are just as likely to be bad out of the box, and the whole situation is very frustrating.....hang in there, it's a marathon....lol

Drive it to emissions test station with sensor unplugged. Stop just out of sight. Plug sensor in. Get test. You know the rest.

Or, get it fixed by a person who knows how to trouble shoot and repair it.

Trouble codes?

Isuzu forums?

Car forums?

Why did you come here?

I'm a flaming know it all genius but I'd never ask these guys how to fix my car if I didn't have a clue myself and could only tell a story about symptoms.

OK, genius may be a little strong. Know it all is really closer.

Got a great laugh at the end of the comment. I will check vacuum hoses also but did a clean up of them about 4 months ago. along with bandaging some of the wire runs.

thank you for the great insight. Glad to see some honest voices in this forum. Huge help ! Have done the Isuzu forums and recall site but no one had this particular symptom. I found all kinds of information on the oil burning and the noisy tapetts however.

Again Thanks

Maybe you got the Lyndoor Industries RODEO Clown!

To add to the good answers from HTRN, there are some vacuum components that are activated only off of idle speed. These components, if bad, will not show up while checking for vacuum leaks at an idle. If you do not find anything after the temp sensor and vacuum leak tests, try this. Warm up the Rodeo till the problem is present. Stop the truck, and disconnect the EGR vacuum hose, and retest. An over acting EGR can dump too much exhaust into the intake. If no change, reattach the EGR, and Check the canister purge valve the same way. There may be other off idle functions, but they should all be connected to the "off idle" port on the throttle body. Good luck.