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1fz low idle problem

Tech Talk for Cruiser owners.

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Posts: 4
Joined: Tue Nov 25, 2008 1:00 pm
Location: Rockhampton QLD

1fz low idle problem

Post by reagz32 »

Hey guys I have a 4.5 80 series and every few weeks for about 4 months it will idle at around 400rpm instead of the usual 700 or so. When it is started it will rev up like usual then drop rapidly to 400 even when cold. It doesn't seem to lose any power, it just idles really low and rough and usually last for a couple of days. Also, it has never began doing it when completely cold, only when started after recently driven. Has anyone had this problem before? Any help would be greatly appreciated.
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Post by crazy eyes »

sounds like the computer goes into limp mode so you need to do a diagnosis on the computer and check for codes .
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Post by djroberts »

ive had this problem and it progressively got worse. i discovered that their were intake leaks on the engine side of the air sensor, meaning it was getting un-metered air! my intake hose and the two breather hoses were perished, after i replaced them it fixed the problem - ideally, a leak test should have been done but replacing the three hoses helped.

hope that helps you, dave.
loose as a goose
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Post by reagz32 »

Thanks guys, I got it put on the diagnostics machine today and it didn't put out any codes. The mechanic seemed to think it was the stepper motor from the ECU which controls idle speed and apparently build up with carbon so he cleaned it up and now its idling fine. Hopefully it has fixed it for good but only time will tell. If this doesn't fix it ill be looking for air leaks. Ill keep you posted.

Cheers

Reagan
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Post by crazy eyes »

know reagen
you should have known that as you do work for toyota hahaha
cheers jason
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Post by roblrc »

Cleaning the idle speed controller usualy fixes the problem. No good looking for vacuum leaks as there would be an increase in idle speed if there was any.
Rob
Rob L
96 Dual fuel GXL 80 series
95 V8 ES Disco
Albury Wodonga
http://www.trailtrack4x4.com
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Post by vSAHARAx »

roblrc wrote:Cleaning the idle speed controller usualy fixes the problem. No good looking for vacuum leaks as there would be an increase in idle speed if there was any.
Rob
x2, had the same problem, got the idle speed motor cleaned, Reset ECU and gave it a tune up and runs like a dream!!!
GXL HDJ80 Cruiser - Lifted, Locked, 315's, 3" Zorst, Safari Intercooled, High Flowed Turbo, All the fruit. AMMS tuned coal shovel, Pushing 148rwhp... + heaps of the black sooty goodness...
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Post by Oneputt »

I had a similar problem a while back. Idled so slow it got lumpy. Whatever it was it sorted itself out and is now back idling as normal. Go figure :?
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