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Isuzu Rodeo high idle problems

8 messages,  Last post on Dec 09, 2008 at 5:05 PM

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#1 of 8 1991 rodeo high idle issues by loganc Oct 29, 2006 (8:32 am)
Hello everyone I have a 1991 Rodeo 3.1 with an idle issue. it is at 185,000 miles and has slowley developed an idle issue.   115,000 miles it recieved a jasper engine. 135 the idle problem started.    it likes 2500 rpm and two things will change its  mind (for a minute anyways untill the light changes) 1: flashing the ignition switch works half the time and 2: coasting in gear untill the  point where speed matches gear and the tranny is  neither pushing or pulling and then the engine will chug and i can press the clutch in and idle  is fine....    i have replaced a slew of parts including plugs cap and wires, many vaccume  hoses, MAP sensor, IAC (idle air), TPS, and carburator gasket (its really a TBI unit)...its time for either an EGR ($65) or fuel injectors ($105 each) does anyone have any ideas? How can i test the injectors? Test EGR? I would really  appreciate some help this is killing gas mileage and clutch! Replies to this message: mbents (Apr 26, 2007 1:53 pm) kf4cln (Mar 25, 2008 7:02 pm) isuzu94 (Mar 29, 2008 10:29 am)
#2 of 8 1990 cougar 3.8 high idle by hdion75 Nov 06, 2006 (8:04 pm)
I recently acquired a 3.8 cougar 1990,and can not figure what is causing a high idle.The vacuum lines appear okay and disconnecting the ais motor changes nothing.Any help would be appreciated. Replies to this message: subfixer1 (Dec 16, 2006 11:00 am) mzannoni (Jan 13, 2007 9:42 am)
#3 of 8 Re: 1990 cougar 3.8 high idle [hdion75] by subfixer1 Dec 16, 2006 (11:00 am)
Replying to: hdion75 (Nov 06, 2006 8:04 pm) Has anyone figured this out yet?   I have a 91 Isuzu Trooper, 2.8 TBI. Two problems: It takes about 10 tries to get the truck to start. I have to keep my foot to the floor or it won't start. It runs real rich until I get the revs up to 3-4K rpm. Then it clears up.   It does this every time I try to start it, warm or cold.   Once it starts, then it idles at around 2K rpm.   If I block the air feed to the IAS, I can get the idle down to around 850 rpm. I replaced the IAS, but there was no change. TPS is correctly set also.   The high idle sounds like a vacuum leak, but I have yet to find it. Don't know if the hard starting is related, but I assume it is.   Help!!!.
#4 of 8 Re: 1990 cougar 3.8 high idle [hdion75] by mzannoni Jan 13, 2007 (9:42 am)
Replying to: hdion75 (Nov 06, 2006 8:04 pm) Hi. Have you figured this out. I have the exact problem with my '92 Cougar. It seemed somewhat high since I've had it (about 3 months), but now it idles at 2500 in Park, about 1200 in drive with brake on. Cannot find any vac leak, but voltage is really high to the injectors. Put in an identical junkyard brain box, no change. (Of course it could also be bad . . .). Please let me know if you've made progress or had success in fixing. Thx.
#5 of 8 Re: 1991 rodeo high idle issues [loganc] by mbents Apr 26, 2007 (1:53 pm)
Replying to: loganc (Oct 29, 2006 8:32 am) My 92 ran so bad and after a while would barely start. I discovered that it was tied to the throttle body fuel injection. Drove me nuts, but found that if I pulled the ecm fuse, then started the engine, shut it down, put the fuse back, then did a reset sequence (depress accelerator slightly, start engine, run for three seconds, shut off for ten seconds, then restart) it went back to normal and has run fine for months. Replies to this message: kf4cln (Mar 25, 2008 7:02 pm) isuzu94 (Mar 29, 2008 10:29 am)
#6 of 8 Re: 1991 rodeo high idle issues [mbents] by kf4cln Mar 25, 2008 (7:02 pm)
Replying to: mbents (Apr 26, 2007 1:53 pm) It works............ I have a 93 rodeo and the ecm fuse trick works. My Rodeo would rev to 2500 rpm when the clutch was pressed, sounded like John Force staging at the Gator nationals ! Thanks
#7 of 8 Re: 1991 rodeo high idle issues [mbents] by isuzu94 Mar 29, 2008 (10:29 am)
Replying to: mbents (Apr 26, 2007 1:53 pm) Thanks very much for this answer. I just tried it on my '94 Rodeo, and it worked like a charm. After weeks of tracking vacuum hoses and checking connections without finding any solution, it's finally now not zooming up to 3,000 RPM every time it idles.   The only slight difference is that when I tried to start it without the ECM fuse in place, it wouldn't. So, I just cranked it a few seconds and stopped. Then put the fuse back in place and followed the rest of the directions. Bingo! Test drive proved no more problem.   Thanks, Thanks.
#8 of 8 rodeo idling high by ozziwi Dec 09, 2008 (5:05 pm)
hi there im new here - so bare with me i have a 1991 4 cylinder 2.6 rodeo and i have been in here reading up on the high idling issues ... mine is idlying at around 1200-1500rpm and cant seem to find where to knock the idling speed down, there is one by the throttle cable/arm adjusted that --made no difference -- any ideas would be greatly appreciated   Cheers Kev - ozziwi Brisbane Australia

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