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On 2004 Isuzu Ascender rpm surges when a/c or defroster is turned on. What could be causing trouble?

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  • Cars & Trucks Master
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The idle air control valve is having a difficult time trying to maintain idle with the ac on,replace the idle air control.

Posted on Jul 11, 2010

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Posted on Jan 02, 2017

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How to fix obd2 trouble code P1680 on a 2004 Isuzu ascender 4.2l eng


code p 0300 refers to random/ multiple misfires detected ===causes --spark plug/s--HT lead/s--injector/s --ignition coil/s--low compression --wiring
most likely low fuel pressure and injector problems
code p 0442 refers to evaporative emission (EVAP) system ---small leak detected ===causes hose connection/s--intake leak-- EVAP canister ---EVAP canister purge valve
it also refers to --large leak detected ===causes ---petrol cap loose ,/missing---mechanical fault ---EVAP pressure sensor
code p 0455 refers to EVAP ---large leak detected --all those stated plus EVAP canister purge valve
code p1680 refers to electric throttle control (ETC) monitor ---processor fault ===causes --wiring--ECT monitor

Sep 30, 2016 | Isuzu Cars & Trucks

1 Answer

Cold starts


May be a bad idle control valve. or a bad oxygen sensor.

Dec 27, 2013 | Isuzu Ascender Cars & Trucks

1 Answer

I have a 2004 Isuzu axiom my check enegine is on .I put new sensors on it ,but the light is still on.


Most people have the misconception that a trouble code tells you what part to replace. The fact is the code tells the mechanic only what to check.
The problem could be a sensor, or a wiring harness, or something mechanical.

Aug 05, 2013 | 2004 Isuzu Ascender

1 Answer

There is a noise coming from the front engine where the ventilator is. It sounds like a diesel car, and the noise increase when the RPM increses.My Isuzu Ascender 2004 has only 60000 mi. I'm wondering if...


I recently purchased a 2004 Ascender with the 4.2l in-line six cylinder motor, and under the 60 day warranty, the fan clutch and water pump had to be replaced. The mechanic told me that the fan clutch wears out causing an out-of-balance condition which puts extra strain on the water pump, which was leaking. Another issue may be that the timing chain needs to be looked at, because the tension wheel/gear for the chain wears out, making the timing chain sloppy. Then the chain flops around inside the housing, making a similar noise to the one you describe. Have your mechanic/technician check it out.

Nov 16, 2010 | 2004 Isuzu Ascender

2 Answers

One by one my gauges(rpm,gas,speedometer,oil) stopped working. Is there a sensor that needs replaced? a fuse? dash? Help?


please keep me posted as well, ALL my gauges are doing the same. First the gas, filled it one day and it fell all the way and light turned on, then my themostat, freaked me out, thought i was overheating,...NO just the guage, NOW my spedometer is stuck on 120, and my RPM's are acting crazy. i have read tons with this same problem, WHY WONT the manufacturer DO SOMTHING??

Aug 25, 2010 | 2004 Isuzu Ascender

1 Answer

Can a rear end collision cause a speedometer on a 2004 Isuzu Ascender not to work?


not sure if a rear colision could cause that but your speed sensor is bad. the speedometer was off and most of the time not working at all, i had the dealer look at it (under warranty at the time) and they replaced the speed sensor and everything is all good now.

are you doors locking automaticly? i guess the speed sensor is hooked up to the auto locks to lock the door when you put it in gear, and mines were not locking at that time also.

Jul 23, 2010 | 2004 Isuzu Ascender

1 Answer

My 2003 isuzu ascender won't start, when you crack


or you have a broken ground wire, an for shifting it mite nutaral safty switch.

Jan 31, 2010 | 2004 Isuzu Ascender

1 Answer

Instrument cluster is going crazy on my 2003 Isuzu Ascender, tach stays at 7000 RPM, fuel gauge all over the place, ammeter says 19 volts, check engine light on & off, among other things.


It may have a faulty cluster. Or possibly could have a charging system problem.
Take it to a dealer and have it scanned for codes.
The instument cluster is a module that can store trouble codes. If the cluster is at fault the new one will have to be programmed to the vehicle to work correctly.

Oct 09, 2009 | 2003 Isuzu Ascender

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