Toyspeed.org.nz Message Board

by **Hachiman** » Thu Jul 14, 2005 11:13 am

Ok im having problems with the idle.
I've only just recently put a 4age in my 85 and its idling funny.
it starts up good and sometimes idles good but then at other times it revs around 2100rpm then drops 500rpm and continues doing this. Any ideas as to why?

Have a look see at the engine to!
viewtopic.php?t=34106

by **Xyrath 86** » Thu Jul 14, 2005 11:38 am

Mine did that when the oxygen sensor wasn't working I think. Or it could be a random vacuum hose.

by **Hachiman** » Thu Jul 14, 2005 11:47 am

Xyrath 86 wrote:Mine did that when the oxygen sensor wasn't working I think. Or it could be a random vacuum hose.

yeah i thought it might of been a vacuum. where bouts is the sensor ?

by **4agepwr** » Thu Jul 14, 2005 1:05 pm

the oxygen senser is located on the exnaust manifold and should have some kind of plug/cable coming from the loom/ecu

by **Hachiman** » Thu Jul 14, 2005 1:18 pm

4agepwr wrote:the oxygen senser is located on the exnaust manifold and should have some kind of plug/cable coming from the loom/ecu

cheers i'll have a look when i get home hopefully it'll solve my problem

by **Mr Revhead** » Thu Jul 14, 2005 4:39 pm

sounds like a dodgy idle valve to me..... bolts to the underside of the t/b

by **fangsport** » Thu Jul 14, 2005 8:56 pm

coolant level??

by **crispy'86** » Thu Jul 14, 2005 11:47 pm

Mr Revhead wrote:sounds like a dodgy idle valve to me..... bolts to the underside of the t/b

Yeah check the vacuum hoses if you still have them on there, or like most people block off. The auxiliary air valve is prone for playing up in them too, that'd make it idle high/low all the time, and coolant level. Throttle position sensor too. check set up right,

by **Hachiman** » Fri Jul 15, 2005 12:58 pm

crispy'86 wrote:
Mr Revhead wrote:sounds like a dodgy idle valve to me..... bolts to the underside of the t/b

Yeah check the vacuum hoses if you still have them on there, or like most people block off. The auxiliary air valve is prone for playing up in them too, that'd make it idle high/low all the time, and coolant level. Throttle position sensor too. check set up right,

Cheers heading out to the workshop in a few i'll have a look. Thanks aye!
btw whens the next 85/86 meet/cruise!!!

by **Flange** » Sat Jul 16, 2005 11:19 pm

Im feeling dumb cos i've checked these and no difference to the idle. Do i have to replace the sensors or check the connections or what? and i couldn't find the idle valve :oops:

Help!

Click here to see "My Black Hole" · by **Stealer Of Souls** » Mon Jul 18, 2005 9:23 am

If you've got a spare throttle body. Then chuck another one on. If the problem disappears then it was either the idle valve or the cold idle-up part (increases idle when engine is cold). I've cooked three cold idle-up bits... Lesson: Make sure you don't overheat your engine....

by **Flange** » Mon Jul 18, 2005 10:43 pm

Stealer Of Souls wrote:If you've got a spare throttle body. Then chuck another one on. If the problem disappears then it was either the idle valve or the cold idle-up part (increases idle when engine is cold). I've cooked three cold idle-up bits... Lesson: Make sure you don't overheat your engine....

Hmmm i havn't got a spare t/b
however i disconected the vacum sensor and it appeared to stop idling funny but was idling higher than it should. round 13-1400rpm.
Maybe a dodgy sensor?

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