Problem for Toyota Cars
Generic problem for all Toyota Corolla Cars
I have a high idle/overheating 1989 Toy...
I have a high idle/overheating 1989 Toyota Carona GLXi 2.0 litre DOHC fuel injected. (New Zealand/Japanese import)
I have 2 problems, and probably related.
the car is overheating (heaters have stopped working recently although it would overheat when the heaters did blow hot air) I have flushed/reverse flushed the radiator and engine block.. water seems to flow freely, I'm not sure how to flush out the heatercore or where it is etc..
Idle is way too high, I start the car it sits at 1200, then climbs to 1500.. then 1600, then 1700 and finally settles between 1800 RPM and 2000 RPM, I have sprayed mass amounts of MAF cleaner into it (air sensor cleaner) have tried all sorts of things to bring the idle down but it is very very keen to stay at 2000rpm no matter what, sun rain shine cold boiling hot.
And of course.. the Car overheats after not long at all now.. maybe 15 mins driving, or quicker if stuck in traffic idling at that high rpm..
for a brief brief time the idle went back to normal (days ago now) and stayed normal for about 50kms of driving during this time it did not overheat and was behaving very normal and reliable.... then it started to idle high again and straight away overheats..
I think if I can stop it idling so high the overheating problem will disappear.. but I cannot figure out how to adjust the idle at all.. there is a screw on the throttle linkage but I doubt that is a fix.. what else determines the idle speed for this car? air filter is clean/no vacuum leaks etc.. I'v done as much as I can, checking and cleaning stuff.. but I dont really know this engine at all and not sure what part is what or where. I have no workshop manual or anything.. pretty much blind as a bat!
any help would be great.. the main thing is it doesnt fluctuate.. it starts at around 1500rpm even from cold, after a little bit it starts its climb to 2000rpm and once it reachs 2000rpm it will never dip below that again.. sometimes it climbs up to 2,200 rpm... its like I dunno... it just keeps climbing up.. what on earth is telling the engine to do this?
Comments:
Aug 20, 2009
- Hey Zoot, thank you very much for that, I would love to check the ISV out but I have no idea where it is...
I'll try describe what I am looking at, so I have the opening to the intake (have removes the air intake pipe from the air filter. so I have a bare intake, inside that I can see a big butterfly, closest to me is the entire throttle linkage, the wire and the bits that open and close the butter fly, to the left of that is an electrical plug into something I dont know what it is.. whatever it is plugged into has 2 bolts and looks like it can be removed... on the opposit side of the intake manifold/throttle body whatever it is called is a box with electrical connection, this one is labelled throttle sensor.. apart from that I cannot see anything else. certainly no other valve stuff that I can unclip and pull out :( its very hard as I dont have a workshop manual and dont know what the part actually looks like.. so I could be staring at it and never know..
Best Solution
posted on Aug 20, 2009
Rank: Guru
Rating: 86%, 194 votes
Check the hoses - especially all the little 10mm hoses that connect vacuum pipes, etc.
There is a device in the throttle body called an Idle Stabilisation Valve - they get gummed up, especially on such an old car, and with NZ's low-petroleum fuel - lots of additives in NZ gas.
They are easy enough to clean - look for a lead plugged into the throttle body near the butterfly - you can unclip it and pull it out complete - they are usually about 15cm long, by about 4cm wide.
Spray it liberally with carb cleaner and make sure it can move freely. If not, a wrecker is the best bet - they are pricey new.
Good luck.
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Asker's Testimonial
"
Hey Zoot, thanks for that, its great advice but I have one problem.. no idea what an Idle Stab. Valve looks like. see my comment on orig ques.
" - rotaryfootso
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