2.3 Fiat Multijet hunting on tickover after timing belt replacement.

[2657]

I recently had the timing belt replaced in Portugal, couldn't arrange to get it done at my usual place in the UK. I also had it serviced but not the fuel filter which has been on for 2 years but little mileage.

Is there anything involved in changing the timing belt that would cause the tickover problem, seems to run ok and smooth tickover before.

The oil was also overfilled which I am not pleased about but done over 1000 miles and no apparent problems.

Any ideas?

 

[Lenny HB]

If they didn't use an OEM belt the cam timing could be a fraction out. Our local independent stopped using Gates belts because of timing problems they also had problems with their water pumps.

 

[gus-lopez]

It might be one tooth out?

 

[Two on Tour]

It might be one tooth out?

That would be my guess too.

 

[chaser]

I recently had the timing belt replaced in Portugal, couldn't arrange to get it done at my usual place in the UK. I also had it serviced but not the fuel filter which has been on for 2 years but little mileage.

Is there anything involved in changing the timing belt that would cause the tickover problem, seems to run ok and smooth tickover before.

The oil was also overfilled which I am not pleased about but done over 1000 miles and no apparent problems.

Any ideas?

Over filling the oil can cause various things, if you haven't drained the excess, I would do it before you do anything else.
Google over full engine oil.

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[eurajohn]

You don't mention what base vehicle or the year of it, maybe that info would be relevant.

 

[2657]

Over filling the oil can cause various things, if you haven't drained the excess, I would do it before you do anything else.
Google over full engine oil.

I would have had it done but had to make this journey, 1000+ miles and no obvious signs.
I have read about the possible problems.

 

[2657]

It might be one tooth out?

That would be my guess too.

I was thinking along those lines but thought that even one tooth out would cause more problems than rough tickover.

 

[daveandsan]

You don't mention what base vehicle or the year of it, maybe that info would be relevant.

2.3 Fiat Multijet hunting on tickover after timing belt replacement.​

 

[2657]

You don't mention what base vehicle or the year of it, maybe that info would be relevant.

It'a a Fiat 2.3 multijet 2011 manufacture, didn't think the base vehicle would matter.

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[dunnah01]

Hunting is usually an air leak somewhere on the inlet side. It may be worth listening to any turbo or inlet pipes you can get at to see if you can hear any tell tale hissing

 

[2657]

Hunting is usually an air leak somewhere on the inlet side. It may be worth listening to any turbo or inlet pipes you can get at to see if you can hear any tell tale hissing

Would they be disturbed during timing belt replacement?

 

[tonyidle]

Hunting is usually an air leak somewhere on the inlet side. It may be worth listening to any turbo or inlet pipes you can get at to see if you can hear any tell tale hissing

Not with any injection engine. The engine sees it as more air and the fuelling compensates resulting in a steady, but faster, Idle. An air bleed pre-efi caused a weak mixture and hunting.

 

[Hettie's Crew]

I had an old Peugeot 106 I bought cheap because it ran oddly at tick over but well when running. I had it checked and the recent timing belt it had had was fitted one tooth out.
Ran perfectly after it had been refitted.

 

[eurajohn]

Diesel engines work on the wide open throttle principal they regulate engine revs via fuel injection, the throttle plate in these engines is predominantly emission control, not so susceptible to inlet air leaks as petrol engines.
Depending on year of the van there are different ways of ensuring the valve timing is correct, a tooth out would cause significantly more problems than an uneven idle

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[chatteris]

I was thinking along those lines but thought that even one tooth out would cause more problems than rough tickover.

I would have thought it would put engine light on as cam/crank corrolation would be out

 

[dunnah01]

Not with any injection engine. The engine sees it as more air and the fuelling compensates resulting in a steady, but faster, Idle. An air bleed pre-efi caused a weak mixture and hunting.

I was thinking more turbo vacuum, MAF & MAP sensor plumbing leaks tbh

 

[2657]

Diesel engines work on the wide open throttle principal they regulate engine revs via fuel injection, the throttle plate in these engines is predominantly emission control, not so susceptible to inlet air leaks as petrol engines.
Depending on year of the van there are different ways of ensuring the valve timing is correct, a tooth out would cause significantly more problems than an uneven idle

That's what I thought re the timing being one tooth out, I hope that if it is a slight air leak it doesn't develop, I can live with a rough tickover until we get back to Portugal and let the garage have a look at it.

 

[gus-lopez]

I would have thought it would put engine light on as cam/crank corrolation would be out

On older engines you can have the cam & crank correct & be one out on the pump which then isn't injecting correctly..
A lot depends on age of vehicle, whether it is old style injection or common rail .

 

[2657]

On older engines you can have the cam & crank correct & be one out on the pump which then isn't injecting correctly..
A lot depends on age of vehicle, whether it is old style injection or common rail .

The 2.3 multijet is common rail, so does this rule out the scenario that you describe?

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[gus-lopez]

The 2.3 multijet is common rail, so does this rule out the scenario that you describe?

It rules out incorrect injection but it would depend on whether it was still possible for there to be clearance between pistons & valves if cam & crank were 1 tooth out? I would think there was.

 

[IRHP]

I was thinking along those lines but thought that even one tooth out would cause more problems than rough tickover.

I had a guy do a timing belt on a Renault I used to have. It was a tooth out. Ran like a two legged dog till he fixed it.

 

[deleted79651]

I had a guy do a timing belt on a Renault I used to have. It was a tooth out. Ran like a two legged dog till he fixed it.

Sounds like the last dog I backed at Birmingham ... But that was also asthmatic ...

Steve

 

[chatteris]

Have they left a sensor unplugged could be running on a default value

 

[jockaneezer]

I changed the timing belt on my neighbour's Renault Megane, I made up the pins to lock the camshaft and pump and the threaded stud to hold the crankshaft stationary. Once the belt was tensioned, the camshaft moved back a fraction when I removed it's locking pin. The engine wound over ok, but was a bit ropey when idling. In the end, I had to skim a fraction off the cam locating pin diameter to "advance" the camshaft, which then dropped back into the proper position once the tensioner was activated. I would say the timing was out less than half a tooth, but it did make it run "lumpy".

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[tribalbrit]

I had similar trouble on last van, there are two breather pipes on top off the engine and right at the front. One of these was off. re fitted, problem solved.

 

[georgio]

It might be an idea to try forte engine cleaner or snowfoam

 

[2657]

I have tried one engine cleaner to no effect but I have another that I will try on the run back to Portugal.

 

[Lenny HB]

What make belt did they use?
Our local independant won't use Gates any more had timing problems with them.

 

[2657]

What make belt did they use?
Our local independant won't use Gates any more had timing problems with them.

It was Gates because I asked them to use theirs as Dave Newell used those when he did the first change.

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