Relay 3.0 Hdi 160Ps Tickover Problem

[pikesrelaybus]

This one baffles me, I have a Iveco 4cyl 160ps 3.0 HDi engine, it's intermittentantly hunting at tickover. It starts, drives and cruises fine but at tickover you can see the throttle body actuator moving slightly with engine revs. Wierd or what. Then, it gets weirder, suddenly you will hear the engine stabilse but accompanies with a "throaty" sound like you'd hear if you'd removed the air filter cover. Examining the throttle body I noticed the valve is now open 20-30% ish. So, effectivily more air is going into the engine, hence the throaty running, but the ECU limited the speed of the engine with injection timing. It's not hunting at this stage but I feel this is the real reason why I keep getting "turbo pressure sensor" errors. The error can be cleared easily enough but!, it's not long before it's back, usually provoked by stopping for a short while (like at the petrol station) where it'll return - Beeeep!

 

I've replaced the throttle body before, I had one of those "old ones" but the replacement was a new one with a small extension wire, Citreon called a £200 wiring loom.. (who they trying to kid hey!)... Anyone suggest anything before I take it to Mr Citreon?

 

[coastline taxis]

What year is the van. and think id be checking the egr valve and pipes and giving it a good clean

[pikesrelaybus]

Yikes.. didn't see the reply, sorry. Bus been into Citroen this week for it's 100k mile service and I'm not the only one thinking EGR valve, engineer was kind enough to point out location and did me a couple of print off's. I'd like to know when this valve engages, reading online stuff I believe it should be inhibited at tickover and at high output power. Everything points to this valve so I'm going to yank the thing out for a clean. Citroen suggested inhibiting it through a remap of the ECU firmware but I'm against that, there is benefits with valve life (apparently) and it's been running a bit rough since 80k miles but never broken down and sometimes it works and ticks over fine. I'm going to make a video and lob it up on youtube, that's my plan.. Eitherway, for others who might have a high mileage rough running 3.0 hdi, there's two main components, the valve itself and the electronic valve that is fitted above the engine on a bracket. The ECU controls this valve which either lets manifold vaccuum to the valce or not, so I guess there's a return spring. The EGR valce is located on the left hand side of the engine near the bulkhead but it's very easy to access. Held in with two bolts. It explains why there is so much crap, soot and oil everywhere within the inlet manifold. I'd already removed and cleaned the throttle body and the sensor to the left. I did have a pressure error which was due to the loose air pipe to throttle body, it was tight but obviously not tight enough with traces of oil spitting onto the top of the engine.. Fingers crossed this solves it. Does 110k miles now... quick question? when is it time to renew timing chain??

[paul.h]

On cars when I 've replaced timing chains, they have all been noisy, like dried peas in a tin can. Whether this applies to the 3.0 hdi though I do not know.