Urgent Request - MOT TIME!

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rgreenhalf
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Urgent Request - MOT TIME!

Post by rgreenhalf » Sun Jun 15, 2008 3:16 pm

Hey all,

It's MOT time again, and amongst other things I've got problems with my IDLE being to high at 1500rpm. I've cleaned the ICV with carb cleaner, and that made no difference. I did have a slight blow where the cat meets the midpipe (I've fixed this with gun gum, albeit just to get it through, it needs a new gasket).

So where else Can i Begin the diagnosis?

Exact symptoms are :

Idles at 1500rpm (steady) when warm.
Idles a little rough on startup (Like its trying to stall.)

MOT due in 10days so need to get some help to get it through, this is amongst all the electrical gremins I've got to deal with too :(

Thanks

Ross
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

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esta
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Post by esta » Sun Jun 15, 2008 3:47 pm

No help here i am afrad (sorry wouldnt know where to begin after the ICV clean) but still need the CEM? :dunno: Good luck! ;)
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clio turbo
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Post by clio turbo » Sun Jun 15, 2008 10:25 pm

mine dose same its the tps
less is more!!!

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rpruen
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Post by rpruen » Mon Jun 16, 2008 8:06 pm

I'll echo the above.

This problem is most often caused by the TPS being either poory adjusted, or just plain broken.

It should be heard to click just as you move the throttle a fraction open. If not try putting a bit of pressure the other way, if it clicks, and with the engine running the idle goes back to normal....

Undo the throttle stop screw half a turn, so the throttle closes a little more. (people wind them in trying to speed up the idle). If the throttle won't move any more, then the butterfly valve is closed, and you need to adjust the sensor.

Remove the throttle body, and clean it. Undo the two screws that hold the sensor, and turn it untill it clicks on opening the throttle, and again on closing it. This is tricky to set up, but it must be right or your car won't work properly.

If the sensor fails to click at all then it is dead, and requires replacement. It's easier to get the whole throttle body off a scrap car, after checking all is ok, as the setup is a pain.

Don't bother trying to set it up on the car, it will take 10 times as long, as you can't get to anything, and the sensor will move when you try to tighten the screws.

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rgreenhalf
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Post by rgreenhalf » Tue Jun 17, 2008 12:50 pm

Well I've confirmed the click can be heard when the throttle its first on. I was thinking of putting a meter on the terminals to try guage resistance, but haven't been able to find any reference values.

I've got a throttle body on a 91 turbo, are these interchangable?
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

rgreenhalf
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Post by rgreenhalf » Fri Jun 20, 2008 8:11 am

Swapped the Throttle Body + TPS over last night, and no joy, still idling high when warm @ 1500rpm. Idles badly when cold too :(
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

rgreenhalf
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Post by rgreenhalf » Wed Jun 25, 2008 2:06 pm

Cleaned contacts on Engine Temperature Sensor, and checked resistance as being correct.

Idle still @ 1500rpm when warm, and all over the place when cold :(

MOT due Saturday, looks like its going to be off the road for a while.....
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

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JohnTurbo
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Post by JohnTurbo » Wed Jun 25, 2008 4:51 pm

Check my guide on testing lambda sensor.

Dead lambdas have a tendancy to affect idle speed on a 480. Very odd.
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esta
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Post by esta » Wed Jun 25, 2008 5:45 pm

Howd it go...? :dunno:
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There are a number of mechanical devices which increase sexual arousal, particularly in women. Chief among these is the Volvo 480 ;)

WANT: 480 GT-Turbo & Jaguar XJR-S
HAVE: Jaguar XJ40 4l Sov
HAD: 480 GT (Lula) & 480 ES (Lulu), Mk4 XR3i (Wall*E), Rover 416i (Junior-R.I.P. bud), X2 (Percy) & Tahiti (Tati)

www.projectjaguar.co.uk

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Post by rgreenhalf » Thu Jun 26, 2008 1:27 pm

MOT Tommorrow :(

Lambda was tested as per your guide JT and was seemingly fine.
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

rgreenhalf
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Post by rgreenhalf » Fri Jun 27, 2008 12:52 pm

Well Good news!

Idle was a bit lumpy for the MOT test, but I told the guy it had 300 duration cams in it :wink:

Its gone through its MOT baby! (only needing a few bulbs which I should have checked, and a CV boot sorting, which Is only a few quid!)

12 more months!
1998 Nissan 200SX - RWD / 260 BHP :)
1990 Volvo 480 Turbo - Sold
1994 Volvo 480 Turbo - Sold
1990 Volvo 480 ES - Broken

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esta
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Post by esta » Fri Jun 27, 2008 1:47 pm

Hey well done there! Glad you got another 12 months under belt!

Enjoy your next years worth of motoring!! ;)
[img]http://i118.photobucket.com/albums/o100/estamace/logo.jpg[/img]

There are a number of mechanical devices which increase sexual arousal, particularly in women. Chief among these is the Volvo 480 ;)

WANT: 480 GT-Turbo & Jaguar XJR-S
HAVE: Jaguar XJ40 4l Sov
HAD: 480 GT (Lula) & 480 ES (Lulu), Mk4 XR3i (Wall*E), Rover 416i (Junior-R.I.P. bud), X2 (Percy) & Tahiti (Tati)

www.projectjaguar.co.uk

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SMOOTH 480
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Post by SMOOTH 480 » Fri Jun 27, 2008 4:10 pm

fantastic mate
good quick thinking with the cam excuse lol now you just need to get a cam for it ;)

have a happy 12 months of motoring 480 style :hopping:
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Post by 480 Tatey » Fri Jun 27, 2008 11:13 pm

Nice one mate! Thats a good excuse for shyte 480 emissions! I might use that one! :lol:

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