SOLVED - High idle, corrects when throttle is 'blipped'

Big lumps of metals and spanners. Including servicing and fluids.

Moderators: User administrators, Moderators

Post Reply
Wilso
Registered user
Posts: 26
Joined: 16 Nov 2016, 20:38
80-90 Mem No: 0

SOLVED - High idle, corrects when throttle is 'blipped'

Post by Wilso »

Vehicle - 1989 2.1 WB.

My engine idles high, around 1500-2000 (no rev counter so can't be precise. it is also stable at whatever Idle speed it chooses).

I've already changed the ISCU, next steps are to clean out ISCV and look at TPS. But I believe these are fine but will check nonetheless.

Any further points to check?
Last edited by Wilso on 08 Mar 2020, 07:33, edited 1 time in total.
Own; T25(3) RHD Carravelle conversion into camper. 2.1 petrol Wasserboxer.

User avatar
Mocki
Membership Admin
Posts: 16957
Joined: 29 Sep 2005, 09:27
80-90 Mem No: 428
Location: Mansfield Notts
Contact:

Re: High idle, corrects when throttle is 'blipped'

Post by Mocki »

throttle cable ??
Steve
tel / txt O7947-137911
👀
________________

1989 2.1LpgWBX HiTop Leisuredrive Camper
1988 2.1 Caravelle TS TinTop Camper 
 

Wilso
Registered user
Posts: 26
Joined: 16 Nov 2016, 20:38
80-90 Mem No: 0

Re: High idle, corrects when throttle is 'blipped'

Post by Wilso »

Mocki wrote:throttle cable ??

Not too sure tbh.. haven't checked yet. However I changed the ISCU back k to the original as the one I bought seemed to make it utter when trying to maintain a cruising speed. When changed back, it carried on doing it.. .so it can't be the ISCU haha. I'll have a better look tomorrow when there's some light and good weather!! :D :D
Own; T25(3) RHD Carravelle conversion into camper. 2.1 petrol Wasserboxer.

Wilso
Registered user
Posts: 26
Joined: 16 Nov 2016, 20:38
80-90 Mem No: 0

Re: High idle, corrects when throttle is 'blipped'

Post by Wilso »

Solved!

Turns out the return spring to put the TPS back to its original position wasn't connected. When it was put back it was evident that the spring was past it, used a drum brake spring as a temp fix whilst I wait for a replacement to be delivered this week. Makes the throttle heavy a f.... hahaha
Own; T25(3) RHD Carravelle conversion into camper. 2.1 petrol Wasserboxer.

User avatar
Mr Bean
R.I.P.
Posts: 3532
Joined: 11 Jun 2008, 06:49
80-90 Mem No: 5485
Location: Hertfordshire

Re: High idle, corrects when throttle is 'blipped'

Post by Mr Bean »

Wilso wrote:Solved!

Turns out the return spring to put the TPS back to its original position wasn't connected. When it was put back it was evident that the spring was past it, used a drum brake spring as a temp fix whilst I wait for a replacement to be delivered this week. Makes the throttle heavy a f.... hahaha

Yes right on the nail but the slight downside is that the concentric spring round the butterfly valve spindle (if thats is what yours has got) imparts little or no side force on the spindle bearings whereas the tension spring applies considerable side force on the bearings even when the throttle stop screw contacts so more or less permanently. I did have marginal success threading a coil spring onto the exposed cable inner as it had what looks like a factory fitted screw clamp ferule on it which looked like that was what it was for. But in the event I turned up a PTFE sleeve to centralise and "lubricate" the concentric spring and rubbing parts. Design/excecution probably brilliant for about ten years but 1988 is a long way off now :roll:
Well-timed silence hath more eloquence than speech.
"A quiet shy boy who took little part in games or sport"
88 High top 2.1 WBX

Post Reply