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Re: trooper 2002 rough idle
Check all your vacuum lines by wiggling them around when it's running, and see if the "hiss" changes at all. Instead of the smoke wand, use soapy water. Just dump it on your intake, and if it's leaking it will bubble like crazy. Smoke wands are for locating leaks in houses, not engines.
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Call your local auto parts store(s). Ask if the can perform an OBD2 check. Most auto parts stores that can, will do this for free. The print out will identify problem areas. However, it sounds like a MAF sensor in your case.
yes sir mostly its a fuel pump regulator problem . check the fuel pump pressure to make sure it is the pump regulator that controls the amount of pump pressure or change the whole pump would be better
have a good day sir
Check make sure all plugs are firing. Sounds like what my 93 Rodeo was doing-Idled okay but very rough when in gear. Turns out only 5 out of 6 plugs were firing due to a defective ignition module- 100 bucks later it works fine.
I have a 2000 Isuzu Trooper that had a PO401 code that would reset and then 2 miles later the light was on again - I found if you remove the EGR valve and start the engine that the engine should idle rough - If it doesnt and you have vacumn at the intake port spray carb cleaner down the port slowly and see how long it takes for the engine to run rough - Keep spraying till the engine dies and spray some more down the passage and let the engine set for 5 minutes and then restart the engine - it will run rough at first but clear out - you should be able to feel the engine RPM change when you put your finger over the intake vaccumn port for the egr - If not then repeat the cleaning method again - If you do feel the rpm change then put the egr valve back on and clear the code and run your drive cycle to see if it is fixed.
On the transmission pan. Lower one is a drain the upper one is the fill level plug. Crank up the engine and let it idle for 3 minutes. Then remove the upper plug, if none comes out squirt some in if some comes out let it drain until it stops. This is the upper plug, not the lower one.
This maybe due to an intake gasket leaking vacuum and causing a lean air-fuel mixture. Check for a vacuum leak where the lower intake plenum meets the cylinder heads. Separating the upper and lower intake manifold is not necessary. These gaskets are plastic and metal. The plastic gasket cracks causing a vacuum leak. This is an unmetered air leak and may cause fuel trim codes like PO171 and Po174 to set. There is an updated gaskets to repair the problem from Isuzu. These codes are for a lean fuel condition, not bad O2 sensors. Do you also have a rough idle?