Dip In Engine Revs Whilst Idling

[stevie m]

I have a ford galaxy (2001) model with an engine idle problem. When I am stationary the engine revs drop for a split second and then rise again. This problem happens when hot or cold but it is not all the time. When I drive the car it feels as if it holds back for a split second and when I start it up it chugs a bit and I have to rev it up to smooth it out. My galaxy has done 160000 miles and I have kept the services up. It has just had it's last service and had a new cambelt and a new maf sensor. I have read the ECU and it show that there is a fault (code 17958) but this was showing ages ago, before the engine had this problem. I have been told that the starting may be down to glow plug ?

 

Is there anybody who can help me with this problem ? Any advice is appreciated. Thankyou

 

Steve

 

Sorry forgot to mention this is a 1.9tdi (115)

[stevie m]

I have changed my glow plugs. The starting problem was better this morning, although the weather was a bit milder and i was home late and out early. The idling problem might have gone too but I haven't given it a long enough run as yet to see. I will post on here the results. To help others

[mumof4]

well it cant be my old Gal as the miles werent that high :blink:.

 

 

idle control sensor pops into mind..but hey, i know noffin me.. :blink:

[stevie m]

Hello again mumof4.... I should of asked you what you thought earlier... by the way this was or maybe still is an erratic problem, would it do that ? If the answer is yes then im looking at it asap.

[mumof4]

i actually had this problem on the veccy, on idle it would go up and down like a yoyo....the EGR valve was disconnected due to a misfire, and it hasnt done it since...coincidence maybe??

 

 

dont 4get the turbo diesel has turbo lag before it zooms.

[stevie m]

Thanks for your reply mumof4 I have been out in it tonight and i did not notice the problem (i was not driving though). I am on a long drive in the morning so i will find out any problems and i will let you know if it continues. I realise that there is turbo lag but this is different feeling. If the problem continues i will try the first thing you said and work from there. Thanks for your continued advice i appreciate it. i will post any findings here thanks.

 

Stevie M

[stevie m]

Well went on that long drive today all seemed well but then things went pear shaped. Problem came back. Must get that sensor sorted mumof4. Now I have another problem noise from my clutch.

[insider]

idle control sensor pops into mind..but hey, i know noffin me.. :blink:

Diesels don't have idle control valves. Engine speed is governed by the amount of fuel injected.

 

Have you tried clearing the fault code to see if it comes back? Are there any other fault codes. Code 17958 is turbo related.

[mumof4]

idle control sensor pops into mind..but hey, i know noffin me.. :blink:

Diesels don't have idle control valves. Engine speed is governed by the amount of fuel injected.

 

.

 

Oopps..sorry Insider, been a while since i had a diesel and my veccy was on my mind.

[stevie m]

Hi there thanks for your info. I have already erased the fault codes. Then i took it out for a long run and sure enough the only fault code that came up was that one. I had a look on the disc i got with my reader and the code was down to imobilizer ? I also checked this out on the internet and found similar info. This fault has been on the car for ages. Oh i forgot . I was looking on here the other night and found a thread about pipes not being connected after service. Mine are ok but I have just changed the maf and had a service and this problem with the drop in revs appeared. I have yet to disconect the maf and run the car to see if idle problem gets better but his problem is exactly the same as mine. Maybe the maf is no good. What do you reckon ?

 

 

:blink:

[insider]

The information I have is the fault code 17958 is a "charge pressure deviation" which I suppose could be related to the MAF as it is this that measures the charge pressure (Mass Air Flow).

However, if you've changed the MAF and the symptoms are the same, the cause could be something else.

[stevie m]

Hi Insider thanks again for your reply. The reason for changing the maf was because it was showing as faulty. This was another code but as I am away on business and I can't remember the code number that was. As soon as I changed it, this was when the problem came about. When I took another reading the maf didn't show up and this code did but it has been all the time. I didn't suspect the maf to be faulty but after reading something on here I think the new one could be although it does not show up on reading now mate. :unsure:

[stevie m]

Just to update all on this problem. The idling problem was down to being sold a duff mass sensor. Rang up the shop where i got it from and they replaced it. They were more than happy to help. Which is rare these days. I still haven't got to the bottom of my starting problem tho. Many thanks for your advice :rolleyes:

[singh]

The mass meter, is that the same as the MAF> (Air Mass Meter)??

 

I remember having a problem with one of my dub's, i took it out..drove it and it drove lovely which meant it had to be replaced!

[stevie m]

Yes mate. Your car could lack performance or be heavier on fuel. In my case the engine idled funny. I bought a new one and that played up. I disconnected it and the car lost performance but the idle problem stopped. It's best to buy a good one. I have a bosch one in mine now and it goes well. :ph34r: