Montego tick over

[calwing]

Back again and I would like to thank those that offered me advice the last time I visited. Sad to say I have tried everything mentioned and still I cannot cure the fast tickover.I thought that I was on the right track twice when I took off and cleaned the stepper motor and the revs dropped to normal tickover. However when I switched off the engine and then started it up again it went back up to 1200-1500 revs and stayed there.I believe that there may be rubber seals in the stepper that sometimes perish and need replacing if anyone knows of this and where I can get replacement seals I would be grateful.When I bought her a few weeks ago I put her staight in for an m.o.t. and she passed on everything except the high revs.and so I am getting very close to giving up and putting her up for sale and hoping that someone with more knowledge than me can cure her.She is a lovely car and drives great and she has 5 months tax.However because I like this car I will give it just one more shot,I certainly can't afford to take her to a garage and pay what they would charge to fix her so for the last time-help!!! thanks Mike

[E_T_V]

Yes I think the rubber seals are definatly the suspect item. The seals aren;t anything special at all they are only rubber O rings. If you go to a bearings and seals place they'll probably have them on the shelf for pence. As a very short term fix normal rubber O rings can be used which are available from lots of places B&Q etc but these tend to swell and split with time as they aren't petrol resistant. If you go a seals place ask for them in VITON and they'll last a lifetime.

[Raúl]

Hello Calwing,

as you know I have the same problem.

Are you tested the air temperature sensor, the coolant temperature sensor and the throttle pedal switch?

These three sensors informs the ECU and the ECU decides how operate the stepper motor.
If the temp gauge works fine, the coolant temperature sensor works fine.

Perhaps one of the conectors has a wrong electrical contact (My car has suffered wrong electrical contacts in other conectors in windows and doors)

This weekend I am going to clean all of them. On monday I´ll tell you about the results.

I´d hope not to test the E_T_V solution at the moment... ;)

Thanks!

(sorry my poor english)

[E_T_V]

The solution of fitting new O-rings is a very simple one. All you need to do is remove the stepper motor from the carb (4 screws I think) Then withdraw the stepper motor. Attached to the motor is a sort of tube with a hole in it. On the end of this tube is two rubber O rings. Simply pull them off and replace with new ones. You may need to re-tune the carburettor after you have put it all back together if the O rings were leaking or split.

If the screws come put of the stepper motor easily the whole job takes about half an hour.

(All of the above directions are from my memory of a fair time ago on a 1.6 engine so you should probably check in the manual what I'm saying is correct.)

[SimonR]

As MGTurbo (Gareth) advised elsewhere the O-Ring size is BS013. I can vouch for the effectiveness of this repair - I used two Viton O-Rings on my white car, they fit a treat.

Good luck (Bueno suerte)

Simon R.

[SimonR]

The solution of fitting new O-rings is a very simple one. All you need to do is remove the stepper motor from the carb (4 screws I think) Then withdraw the stepper motor.

If the screws come put of the stepper motor easily the whole job takes about half an hour.



Very nearly right! :) There are *three* screws which can be a pain in the ass to remove if they've been there a long time. I had this problem and used an electric drill/screwdriver with exactly the correct sized pozidrive bit. I braced by shoulder against the end of it so that it couldn't pop out and mangle the screws and then very gently squezed the trigger to persuade the screws to move. If all else fails (as it has done for me in the past) saw off the screw head and then with the motor removed use a pair of mulgrips to grip it and turn it off.

[G Force]

Mike if I remember correct your motor is an early 2.0 EFI so all the O ring advice is not relevant. Have you cured the temp gauge problem as this may be the route cause of your problem. If so then tell us what is the position now.

The more info you give the better.

Cheers Gary ;)

[G Force]

[QUOTE=Raúl]

Perhaps one of the conectors has a wrong electrical contact (My car has suffered wrong electrical contacts in other conectors in windows and doors)

QUOTE]

Raul I was thinking that your problem could be a fault in the stepper motor wiring.

Can you check for continuity and short circuit the five stepper motor wires back to the ecu.

cheers gary :)

[Raúl]

Hello again!

On Sunday I cleaned all the sensors and its electrical contacts.
The symptoms didn´t dissapear.:giveup:
I think E_T_V was right and stepper motor is sticking because of the seals.
I need 2 O-Ring seals sized BS013 in viton material.
The problem is that it is nearly impossible in Spain. :banghead:
Can you help me to get them?

Thanks!

[E_T_V]

A car place is unlikely to help but your local seal supplier should be able to. Have a look in your local directory for a seal supplier in your area (they are often bearings and seal suppliers in the UK).

[SimonR]

I need 2 O-Ring seals sized BS013 in viton material.
The problem is that it is nearly impossible in Spain. :banghead:
Thanks!

Raúl, PM me your address and I'll send you a couple - I ordered a job-lot a while back and have a couple spare.

All the best,

Simon R.

[Raúl]

Hello!

The news:

I changed the two o-rings of the stepper motor (with the new ones by courtesy of Simon... thanks again Simon! ;) )...
...but the symptoms didn`t disappear...
so (after a vey hard and long search on scrapyards) I buyed a new (old) carburettor...
...and I changed it...
...and the symptoms didn`t disappear...
...so I changed the coolant temperature sensor...
...and finally this change solved the problem with the tickover!

Notice that the temperature gauge worked fine apparently !

I attach some photos as I promised

Thanks for your disinterested help,

Raúl.

[E_T_V]

Glad you got it sorted in the end.

Good to see some photos too of work in progress. Could I use them in future posts when people ask the same question?

[Raúl]

Hello E_T_V,

of course you can use the photos the way you want. This is the reason because I took them. :) Here you have the last photo I took of the stepper motor.

Raúl.

[MaestroMatt]

Ah yes, the damned temperature sender. My car has been mucking me around recently and after buying a new fuel ECU from eBay and realising that that was not the problem, I changed the temperature sender yesterday. Seems to have done the trick, but I'm going to give it a few days before declaring it fixed.