240GLT rough idle, 1988 model, 2.3L.

Nov 28th, 2003, 18:40

Now that winter is upon us, the gremlins have surfaced. My usually solid performer is acting up. The problem: after the engine has warmed up the idle is all over the place to the point of stalling, but not quite. When the electrics are on it's even worse. Aside from this, acceleration and power are as smooth as you like. Any ideas???

JOHN 850 · Nov 29th, 2003, 17:50

Sounds like an air leak to me ! Spray wd40 round the inlet manifold & injectors when the engine is running. If revs pick up ay all, then you know where to start ! Also, there is an air idle valve - check to see if working as per the haynes manual.

Cheers,

John.

Dec 1st, 2003, 17:28

Thanks John, I think I have it sussed. Did the usual with the WD40 on the ignition gear and injection system to no avail, and noticed a black knob under the inlet manifold toward the front. Once adjusted, this did the trick by upping the idle. Don't quite know what the black knob is for, but let's hope there won't be any side affects.

Cheers

Tony

Peter Milnes · Dec 2nd, 2003, 01:57

That is the idle speed adjuster, mate, hence the increased idle speed.

All the best, Peter

Dec 4th, 2003, 18:29

Cheers, Peter. I didn't think the adjustment was this easy on EFI engines and Haynes wasn't very clear... If it was a snake, it would have bit me!

Tony

Nov 28th, 2003, 18:40	#1
SWEDISHT Guest Location:	240GLT rough idle, 1988 model, 2.3L. Now that winter is upon us, the gremlins have surfaced. My usually solid performer is acting up. The problem: after the engine has warmed up the idle is all over the place to the point of stalling, but not quite. When the electrics are on it's even worse. Aside from this, acceleration and power are as smooth as you like. Any ideas???

Nov 29th, 2003, 17:50	#2
JOHN 850 Senior Member Last Online: May 14th, 2024 21:32 Join Date: Dec 2001 Location: North Yorkshire	RE: 240GLT rough idle, 1988 model, 2.3L. Sounds like an air leak to me ! Spray wd40 round the inlet manifold & injectors when the engine is running. If revs pick up ay all, then you know where to start ! Also, there is an air idle valve - check to see if working as per the haynes manual. Cheers, John. __________________ Current : 2020 XC60 R Design, 1998 C70 T5 Coupe, 1988 360GLT, 1999 C70 TDI Previous : V90 RD, 360GLEi, V70TDI, V70 2.5D, 965, C70 T5 x3, 340 x2, 360GLT x4, P1800ES x3, 240 x3, 940 x2, S70 x3, 850 x3, S80, 480 x2, 120 x2, XC90 x2, V70 D5 x3

Dec 1st, 2003, 17:28	#3
SWEDISHT Guest Location:	RE: 240GLT rough idle, 1988 model, 2.3L. Thanks John, I think I have it sussed. Did the usual with the WD40 on the ignition gear and injection system to no avail, and noticed a black knob under the inlet manifold toward the front. Once adjusted, this did the trick by upping the idle. Don't quite know what the black knob is for, but let's hope there won't be any side affects. Cheers Tony

Dec 2nd, 2003, 01:57	#4
Peter Milnes Premier Member Last Online: Apr 10th, 2014 00:01 Join Date: Feb 2002 Location: Tonyrefail	RE: 240GLT rough idle, 1988 model, 2.3L. That is the idle speed adjuster, mate, hence the increased idle speed. All the best, Peter

Dec 4th, 2003, 18:29	#5
SWEDISHT Guest Location:	RE: 240GLT rough idle, 1988 model, 2.3L. Cheers, Peter. I didn't think the adjustment was this easy on EFI engines and Haynes wasn't very clear... If it was a snake, it would have bit me! Tony

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