johntom Posted January 27, 2011 Posted January 27, 2011 Hi when I started my C5 2.0 HDI today (from cold), I could feel a suddering or vibration through the drivers seat. When I accelerated slightly (to 1000rpm) it smoothed out and disapeared. I looked under the bonnet whilst the engine was ticking over and the engine appeared to be shaking forwards/backwards but when revved it becomes still? When warm the vibrating is still there at junctions, but not all the time? Any ideas out there, the car is a 2004 and has done 80K. Quote
paul.h Posted January 28, 2011 Posted January 28, 2011 Have a look at the engine mountings as a start in case they are worn out. Quote
johntom Posted January 28, 2011 Author Posted January 28, 2011 Hihow would i know if they had worn, are they hydrolic ? Quote
paul.h Posted January 28, 2011 Posted January 28, 2011 Haynes shows 3 rubber mountings, each side and the back and to check if the rubber is in good condition, the bolts are ok and tight and to lever the mountings to see if there is excessive play. Quote
johntom Posted January 28, 2011 Author Posted January 28, 2011 Thanks, i will investigae tomorrow and report back. Quote
johntom Posted February 10, 2011 Author Posted February 10, 2011 Hiwhere abouts is the third engine mount (can see 1 either side of the engine)? Quote
paul.h Posted February 10, 2011 Posted February 10, 2011 At the back fastened to the driveshaft intermediate bearing housing and subframe so will be low down. Quote
johntom Posted February 10, 2011 Author Posted February 10, 2011 Thanks, i will look underneath at the weekend Quote
Johndouglas Posted February 11, 2011 Posted February 11, 2011 The bottom doughnut is usually the first to go since it spends its life in mucky surroundings and when it becomes soft does give the symtoms you describe. But I would have thought at 80K it was way too soon for it to happen. My own C5 is almost on a similar age and mileage and its mounts are like new. I think I would be looking to see if any fault codes were stored. Quote
paul.h Posted February 11, 2011 Posted February 11, 2011 Does this engine have a dual mass flywheel fitted ? A fault with this has been suggested on other posts as a cause of vibration but there has not been any follow up posts of the results. Quote
johntom Posted February 11, 2011 Author Posted February 11, 2011 Hiyes i think it does have the dual mass flywheel, it's the 110 bhp. Would an engine mount vibration almost disapear above 1000rpm and be at it's worst on cold start up? Quote
Guest roddersmole Posted February 16, 2011 Posted February 16, 2011 Hiyes i think it does have the dual mass flywheel, it's the 110 bhp. Would an engine mount vibration almost disapear above 1000rpm and be at it's worst on cold start up?hi there if you do find out the problem let me know has ive got the same problem ,ive fitted new injectors and serviced the car but still shaking its nuts off at every junction ...cheers rod,, Quote
iannez Posted February 17, 2011 Posted February 17, 2011 dmf as paul said. done a few of these for this fault. face plate starts to break away and causes crankshaft imbalance. Quote
Guest roddersmole Posted February 17, 2011 Posted February 17, 2011 dmf as paul said. done a few of these for this fault. face plate starts to break away and causes crankshaft imbalance.ive had brand new clutch and flywheel fitted so its not that i think what were trying to say is that the car seems to have a shake due to firing on three cylinders not 4 so its more fuel or injector problem than the clutch,when the car has been run for a while the shake goes away then comes back after parking up .any advise would be great .cheers rod Quote
johntom Posted February 17, 2011 Author Posted February 17, 2011 Hithats exactly right, the car always shakes when cold, this improves to 'no shake' when the revs increase above 1000rpm. When warm it's definitely better, but not always. The car performs very well during normal driving with no warning/management lights. I will be checking the bottom engine mount at the weekend, if thats not gone then i think it will be time for a diagnostic ? Would it damage anything if i pull an injector plug off 1 at a time and see if there's a difference in tickover, ie no difference means that cylinder isn't firing ? Can't understand why it improves when warm though, sensor or expansion (if its the mount)? Quote
iannez Posted February 17, 2011 Posted February 17, 2011 pulling a plug off a diesel injector with the engine running could cause serious damage to your engine (broken con rod/damage to block). you need to do a leak off test or remove the injectors and send them to a diesel specialist to be tested. Quote
Guest roddersmole Posted February 18, 2011 Posted February 18, 2011 pulling a plug off a diesel injector with the engine running could cause serious damage to your engine (broken con rod/damage to block). you need to do a leak off test or remove the injectors and send them to a diesel specialist to be tested.hi there ive already done that procedere and also had it on the lap top with the new software lexeus and shows all is working well theres no problems ..if you pull an ijector off it puts the engine managemant light on ..ive tried all this and even had new injectors fitted..still no joy im getting very frustrated with had the car 6 years without any probs ..cheers rod Quote
Guest C5buff Posted February 20, 2011 Posted February 20, 2011 Hi Could you have a sticking exhaust valve? perhaps broken valve spring. Or simply a duff injector. Is there smoky exhaust? maybe a compression test at a garage after engine has cooled down might reveal something. This is a type of fault that the onboard computer may not be able to work out so there will be no fault code. Quote
johntom Posted February 21, 2011 Author Posted February 21, 2011 Hion Sunday i fitted an Egr blanking plate (between the casting on the end of the intercooler pipe and the corrigated pipe, near the bulkhead, center), on start up the car now feels smoother, even first thing in the morning and it seems to pick up better, coincidence ? The bad news however, after restarting the car after it's first journey (of 17 miles) the engine management and service light came on, along with the 'antipollution fault' message ? Would blanking off the EGR valve cause this? Quote
Guest roddersmole Posted March 18, 2011 Posted March 18, 2011 Hion Sunday i fitted an Egr blanking plate (between the casting on the end of the intercooler pipe and the corrigated pipe, near the bulkhead, center), on start up the car now feels smoother, even first thing in the morning and it seems to pick up better, coincidence ? The bad news however, after restarting the car after it's first journey (of 17 miles) the engine management and service light came on, along with the 'antipollution fault' message ? Would blanking off the EGR valve cause this?hi there ive sorted my shudder at ticker after 2 weeks of hard work trying to find the problem woodywoodpecker of this forum came and put on the lexus laptop and hey presto doggy injector stripped the engine down and replaced ,now she runs like a dream..thanks woodywoodpecker your my number 1....thanks rod Quote
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