OT: V40 engine issue

dragon · Post by **dragon** » Mon Sep 12, 2005 11:35 am

OK, I'm risking being moaned at by posting here, but we seem to have allowed 440 and 460 owners to post, so I'm having a little go here too (bear in mind the V40 is the successor to the 480 - i.e. they were made on the same production line and there's a good few parts which share components (like the infocentres)...

Anyway, my car has a wierd issue - whenever you put the foot to the floor, it zooms so far, then judders violently, like a rev limit reached, or more likely the CEM is retarding the engine for a reason, if you keep your foot down, when it judders, after a second or two, the car leaps forward "through" the barrier, only to do it again moments later. For reference, an example: 3rd gear at 5000rpm is one such place it does it (redline on the T4 is 6500)...

What are the most likely things I need to be looking at? Gonna get the covers off and have a look at the sparks etc to see if they have any tell tales to tell...

martinholmesuk · Post by **martinholmesuk** » Mon Sep 12, 2005 11:38 am

running lean / air leak / How does it go if you just bring up the power nice and slow?

lee · Post by **lee** » Mon Sep 12, 2005 3:24 pm

like a rocket

chris1roll · Post by **chris1roll** » Mon Sep 12, 2005 5:38 pm

...and from a moderator too!

have you tried the traditional disconnect the battry overnight to reset all the momories?

Bramdeman · Post by **Bramdeman** » Mon Sep 12, 2005 9:24 pm

First thing to look at is the sparks me thinks

btw does this mean i can start asking v70 questions ?

martinholmesuk · Post by **martinholmesuk** » Mon Sep 12, 2005 9:28 pm

I swear this was in the wastegate

Maybe we should open "Other volvo models' thread.

Brasco · Post by **Brasco** » Mon Sep 12, 2005 9:30 pm

martinholmesuk wrote:I swear this was in the wastegate Maybe we should open "Other volvo models' thread.

Yeah, in VOC!

Roo · Post by **Roo** » Mon Sep 12, 2005 9:38 pm

Brasco wrote:
martinholmesuk wrote:I swear this was in the wastegate Maybe we should open "Other volvo models' thread.

Yeah, in VOC!

dragon · Post by **dragon** » Tue Sep 13, 2005 11:53 am

OK fine, I'll remove this tonight. But in return I'm going to start deleting any thread mentioning any car other than 480s, seem a fair swap?!?!?!!?

I'll also remove any thread which rambles off topic

And simply any I dont like.

Hows that?!?!?

MatBat · Post by **MatBat** » Tue Sep 13, 2005 12:07 pm

Yeah delete all martins posts too, he has too many.

Back on the off topic.

Does your car have the diagnostic feature? if not why not get it put on a diagnostics machine?

martinholmesuk · Post by **martinholmesuk** » Tue Sep 13, 2005 1:10 pm

dragon wrote:OK fine, I'll remove this tonight. But in return I'm going to start deleting any thread mentioning any car other than 480s, seem a fair swap?!?!?!!?

I'll also remove any thread which rambles off topic

And simply any I dont like.

Hows that?!?!?

No don't delete this, Delete Mat's posts!

TBH I really think OTHER VOLVO or OTHER CARS would be a good thing.

Murf · Post by **Murf** » Tue Sep 13, 2005 5:22 pm

Ha ha, me and roo can fill it up with ford talk and upset adam

Roo · Post by **Roo** » Tue Sep 13, 2005 5:27 pm

Murf wrote:Ha ha, me and roo can fill it up with ford talk and upset adam

Dan The 'Ex 440' Man :) · Post by **Dan The 'Ex 440' Man :)** » Wed Sep 14, 2005 12:11 pm

dragon wrote:OK fine, I'll remove this tonight. But in return I'm going to start deleting any thread mentioning any car other than 480s, seem a fair swap?!?!?!!?

I'll also remove any thread which rambles off topic

And simply any I dont like.

Hows that?!?!?

I don't mind you doing that, i'm no longer a 440 owner

Just point them to the VOC... That's such an exciting site, i mean informative site

Good idea opening this forum i think... Sorry, i'll let you get back on topic now...

Big Brother · Post by **Big Brother** » Wed Sep 14, 2005 5:38 pm

Murf wrote:Ha ha, me and roo can fill it up with ford talk and upset adam

Murf · Post by **Murf** » Wed Sep 14, 2005 5:59 pm

martinholmesuk · Post by **martinholmesuk** » Thu Sep 15, 2005 4:51 pm

Did Gaz get the problem sorted?

dragon · Post by **dragon** » Thu Sep 15, 2005 5:17 pm

Nope - yesterday the engine light decided to come on permanently, but today the lights off - still struggling though. Haven't been able to look at anything yet - been pissing it down all day today... See if I can have a look tomorrow lunchtime and if not, I'll still discon the battery overnight to see what happens - then I'll have a look at the campsite

dragon · Post by **dragon** » Wed Sep 21, 2005 8:54 pm

Well so far I have someone saying it's a fuelling issue, someone saying it's a wastegate issue causing the ECU to retard, I have someone saying it's rich, I think it might be throttle position sensor related...

Too many options.

One thing's for sure - fuel economy is **screwed** - nearly empty and I'll be lucky to get 240 miles from this tank, the norm is between 330 and 360!!!

martinholmesuk · Post by **martinholmesuk** » Wed Sep 21, 2005 9:25 pm

I not take much notice of

Wastgate causing retarding
or throttle switch

all based on 480 owning of course.

Running rich caused by a screw sensor (temp) or exhuast sounds good to me.

Would explain the low MPG