k-Series – Engine Idle problems
Discussion
Help! I have for several months had a problem with a 1.6 1999’ T Rover 216 K-series engine, (currently residing in a GTM Libra kit car).
The engine will occasionally idle normally and then raise the idle to 1,500 rpm. After acceleration or high speeds it will hold the rpm at 3 – 2000rpm. Sometime a blip on the accelerator will fix but not always, all these symptoms can be recreated with the throttle cable disconnected!
So far I have change the following, each time usually gives a slight improvement but after a bit it all goes wrong again.
- plugs & leads including king lead
- IACV x 2
- TPS (has alloy TB)
- ECU
- Two garages have checked for leaks on the inlet manifold and none have been found.
The MOT is due in a few weeks and I can not rely on it to idle, so it will have problems passing!
Thank you for any help, have been trying to solve this since November!!!
The engine will occasionally idle normally and then raise the idle to 1,500 rpm. After acceleration or high speeds it will hold the rpm at 3 – 2000rpm. Sometime a blip on the accelerator will fix but not always, all these symptoms can be recreated with the throttle cable disconnected!
So far I have change the following, each time usually gives a slight improvement but after a bit it all goes wrong again.
- plugs & leads including king lead
- IACV x 2
- TPS (has alloy TB)
- ECU
- Two garages have checked for leaks on the inlet manifold and none have been found.
The MOT is due in a few weeks and I can not rely on it to idle, so it will have problems passing!
Thank you for any help, have been trying to solve this since November!!!
BCER said:
The engine will occasionally idle normally and then raise the idle to 1,500 rpm. After acceleration or high speeds it will hold the rpm at 3 – 2000rpm. Sometime a blip on the accelerator will fix but not always, all these symptoms can be recreated with the throttle cable disconnected!
Original plastic throttle body housing? These are known to distort and stick, causing strange high idle.
Replace with a 48mm aluminium throttle body from a recent engine and that should fix it.
52mm trophy throttle body is probably not very useful on a 1.6
Bye, Arno.
Ergh, will have to be totally honest here, no. Have looked at the obvious ones and sprayed them with copious quantities of WD40. I did find a new one today and spray that, the drive home will tell if that has helped. Shall put it on the list of things to do, try though.
Did’t go the VVC route as the old HGF issue seemed too much of an issue but the 1.6 has a much better reputation and is a good square engine, often sounds a bit like a flat four, someone once commented that it sounded like a highly tuned Beetle! Not sure I like that analogy though!! : )
>> Edited by BCER on Friday 10th June 16:13
Did’t go the VVC route as the old HGF issue seemed too much of an issue but the 1.6 has a much better reputation and is a good square engine, often sounds a bit like a flat four, someone once commented that it sounded like a highly tuned Beetle! Not sure I like that analogy though!! : )
>> Edited by BCER on Friday 10th June 16:13
Right a bit of an update and question in one!
Over the last week I have change the following:
- IACV housing for a new one with a tighter fit.
- The Brown sensor, Engine Coolant Temperature (ECT) sensor.
- The Green sensor, Intake air Temperature (IAT) sensor.
This has given the following results,
- It will now hold an idle of 1000 to 800 dependant on if it is warm or not, and will not climb.
- Most of the time the revs will drop off.
- It does still occasionally hold the revs at 3k, 2k and sometimes 1.5k rpm. This seems to only happen when coming off a held power.
So this leaves just one more bit to solve! The next suggested sensor to replace by Martin of Reylands is the Lambda, (Heat Oxygen Sensor) or the Crankshaft Position Sensor, (CKP). So can anyone imagine these two causing the above symptoms?
I am nearly there I think, and it looks like it is basically a combination of multiple sensor failures, but they are not totally failing!
Cheers
Over the last week I have change the following:
- IACV housing for a new one with a tighter fit.
- The Brown sensor, Engine Coolant Temperature (ECT) sensor.
- The Green sensor, Intake air Temperature (IAT) sensor.
This has given the following results,
- It will now hold an idle of 1000 to 800 dependant on if it is warm or not, and will not climb.
- Most of the time the revs will drop off.
- It does still occasionally hold the revs at 3k, 2k and sometimes 1.5k rpm. This seems to only happen when coming off a held power.
So this leaves just one more bit to solve! The next suggested sensor to replace by Martin of Reylands is the Lambda, (Heat Oxygen Sensor) or the Crankshaft Position Sensor, (CKP). So can anyone imagine these two causing the above symptoms?
I am nearly there I think, and it looks like it is basically a combination of multiple sensor failures, but they are not totally failing!
Cheers
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