FazerBob
|
| posted on 29/1/08 at 11:08 PM |
|
|
Nissan engine fault
Not a kit car problem but a sticking throttle on my neighbours Nissan Almera.
Throttle action is fine when the engine is cold, but starts to stick more and more as the car gets warm. After about 5 miles the car is very
unpleasant to drive, with quite a solid push needed to get the accelerator to move from the rest position.
I have done all the obvious things like removing the cable and checking/oiling it (I had intended to renew the cable, until I took it off and found it
to be perfect - no sticking or friction)
Next I completely removed the pedal assembly, cleaned and greased everything, but that made no difference.
Then I dismantled the throttle body, expecting to find a ring of sticky carbon where the plate rests. There was a bit of carbon there, but not
excessive, so a clean and polish sorted that.
I'm now getting quite puzzled, every moving part has been stripped, cleaned and lubricated (including IAC valve etc) and everthing is
re-assembled correctly.
The local main dealer can offer no ideas, except to "bring it in for a couple of days, and we'll have a look" Naturally my
neighbour is not taken with that course of action.
More information came to light when I took the car for MoT last week. I was asking the tester about the problem, and of course he hadn't
encountered it before, but when he sat in the car and pressed the throttle it was perfect. Naturally I didn't believe him, and tried it myself
- and yes there was no sticking at all, in fact the car was cured - until I started the engine to drive home - then the problem returned!
So what we have is a throttle pedal that feels to have a massive amount of friction/sticking, definitely 'feels mechanical' but only
occurs with the engine running, so is it something electronic? there are no fault codes being raised by the ECU and nothing in code memory - -
help!!
Bob
|
|
|
|
|
DarrenW
|
| posted on 29/1/08 at 11:16 PM |
|
|
Do any of the linkages or cable run near a heat source? Has any work been done prior to the fault appearing that could have caused it (ie has anything
been disturbed? mind you if youve done some serious maintenance then i guess any evidene would be gone now).
Im not familiar with the Almeria but does it have a cold start valve that works on the cable? or does the cable run mechanically all the way from
pedal to engine with no gizmo's connected?
I assume when the throttle is playing silly beggars, if you turn engine off it stops doing it immediately. If so it doesnt sound like its purely a
mechanical issue, mor to do with a sensor or valve etc.
[Edited on 29/1/08 by DarrenW]
|
|
|
iceman26
|
| posted on 29/1/08 at 11:34 PM |
|
|
how old is there was a bullitin on them i will have a look at work tomorrow
|
|
|
marcjagman
|
| posted on 30/1/08 at 11:01 AM |
|
|
Had same problem on a vectra, squirt some cleaner down the throttle body as the flap may be sticking do to the gum that collects.
|
|
|
Schrodinger
|
| posted on 30/1/08 at 12:40 PM |
|
|
Is the throttle purely mechanical?
A lot of modern cars "fly by wire" and only use the cable for limp home mode.
I would guess not as you have taken the lot apart, try waiting for it to "stick", stop turn off the ignition and try the pedal and see if
it does it then. If not the must be "something" interfering with the throttle.
Keith
Aviemore
|
|
|
Schrodinger
|
| posted on 30/1/08 at 01:13 PM |
|
|
Just had another thought could it be the throttle pot as I beleive there have been problems on this car.
Keith
Aviemore
|
|
|
britishtrident
|
| posted on 30/1/08 at 02:22 PM |
|
|
Could be a distorted throtllebody -- especially if its a plastic one.
Rover went through a patch of this sort of problems that was caused by merkins replacing the plastic hose clip that held the inlet trunking to the
throttlebody by a proper steel jubilee clip which exerted too much force on the throttlebody.
Another thing that can cause this sort of problem is set the butterfly idle stop too low --- it upsets the ECU which opens the IAC in an attempt to
compensate.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
FazerBob
|
| posted on 30/1/08 at 08:37 PM |
|
|
Thanks for the replies guys, a couple of promising answers, but to answer some of the points raised:
Throttle cable is a standard, mechanical one, routed correctly, not too near any heat sources and no 'gizmo's' attached.
Car is a 2001 Almera 1.8 Sport.
Throttle body is alloy.
Throttle only sticks in the rest (closed) position - engine is idling correctly, so IAC valve is not being triggered.
When throttle is sticking switching off the engine INSTANTLY 'cures' it. Start the engine, and it's sticking again! very strange
fault this one.
Bob
|
|
|
