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I posted a similar question recently where my 2004 dispatch van was stuttering slightly at motorway speeds when maintaining a speed - basically, when doing 60ish mph, it would suddenly feel like the van was hit by a head wind. A slight press on the throttle would solve the issue.
Since this, I've replaced both the fuel and air filter, which made no difference. I've also taken it to a garage who plugged it into the diagnostic machine and no faults were showing.
I have used it earlier and it was doing the same, but all of a sudden, it started jerking when trying to maintain a speed, as if the engine was trying to stall. This would stop I I floored the throttle or got off it completely.
Basically, I got home driving it like a 2 stroke, throttle on full, or throttle off.
Temp is normal, oil level ok, water level ok, no strange or unusual sounds. No engine management light. When the throttle is fully down, it just accelerates normally with no issues. When I'm still in neutral, I can accelerate through the revs with no issue or stuttering, so it's only when the engine is under load.
Last time I posted, people suggested air flow meter or throttle position sensor. I haven't changed these as I thought any fault on these would be shown on the diagnostic.
Any thoughts?
Thanks
I posted a similar question recently where my 2004 dispatch van was stuttering slightly at motorway speeds when maintaining a speed - basically, when doing 60ish mph, it would suddenly feel like the van was hit by a head wind. A slight press on the throttle would solve the issue.
Since this, I've replaced both the fuel and air filter, which made no difference. I've also taken it to a garage who plugged it into the diagnostic machine and no faults were showing.
I have used it earlier and it was doing the same, but all of a sudden, it started jerking when trying to maintain a speed, as if the engine was trying to stall. This would stop I I floored the throttle or got off it completely.
Basically, I got home driving it like a 2 stroke, throttle on full, or throttle off.
Temp is normal, oil level ok, water level ok, no strange or unusual sounds. No engine management light. When the throttle is fully down, it just accelerates normally with no issues. When I'm still in neutral, I can accelerate through the revs with no issue or stuttering, so it's only when the engine is under load.
Last time I posted, people suggested air flow meter or throttle position sensor. I haven't changed these as I thought any fault on these would be shown on the diagnostic.
Any thoughts?
Thanks
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18 Comments
sorted byEventually they did away with the pump in the tank and the high pressure fuel pump sucked it from the tank, using a different part of the pump.
If you want to pursue this yourself it might be worth buying a cheap diag machine or a Bluetooth OBD (they're about £5 on Amazon) and if you can recreate the fault get a mate to read the data on the diag and look for something acting funny.
Thanks - I will try to find out if there is one or not.
Thanks. I got my mate at the garage to connect his snap on diagnostic kit but that was when the fault was small. Not it's bigger, maybe it will pick something up. To be honest, I'm totally stumped! I'm surprised the engine management light hasn't come on, as the van really was struggling, as if it was starved of fuel until I booted the throttle. Hopefully the diagnostic will pick up something now, otherwise it begs the question of why the system isn't recognising the fault!
To be honest, I had considered a bad batch of fuel, as I filled it earlier and it did seem better, after changing the filter, but now it is much worse! Thanks for the info though
However could be something more sinister like fuel pump or injector/s.
Glowplugs sometimes cause stuttering too but they're usually more obvious, would usually struggle to start when cold and smoke quite a bit.
Thanks for this. Don't think it's the glow plugs as it starts first turn, even on the recent cold mornings.
I can't see any leaks around the injectors so I'm hoping it's not these or the pump.
If it was the pump, would it struggle through the rev range?
Thanks - I didn't realise it had this. I used to have a bike that had the same, basically the previous owner had used too much tubed gasket which had gone into the oil and clogged that filter, starving the top end of oil and melting the cam shaft! Hope it's not that!!!!
Thanks, it'll be going into a garage Monday morning
I'd be interested in the fuel rail pressure. could be a faulty regulator
Sorry, I've been away and only just seen this.
In short, no!
I tried the filters, patching the exhaust, egr valve and then just got fed up and sold the van (on eBay fully describing the fault).
There didn't seem to be a fault with the injectors or anything. The next option was to take it to a fuel injector specialist, as they have the correct equipment to check all pressures.
I've heard of these vans having fuel pick up issues, it could be one of the inline filters blocked - i.e. The one in the fuel tank or the one (a small gause) in the fuel pipe.
If the diagnostic isn't picking up problems, I was told with mine it would be a pressure issue - either the fuel pressure going into the engine or the exhaust pressure leaving it.
I'd suggest going to an injector specialist to have these pressures checked, as a normal garage with general diagnostic equipment wouldn't pick up on this.
Sorry I can't be of any more help.