All diesel experts. What could the problem be?

damo4runner · **Joined:** Wed Aug 01, 2007 7:07 am **Posts:** 100

Hi guys from the land down under (Australia).

Just wanted to pick your brains and find out if I am imagining things are wrong or if it is all normal. I recently changed to 245/70 R16 tyres up from the 235 factory spec no pinion reset as they are only 15mm taller 3/5th of an inch, and have 5,000klms ago (3100 miles) changed to Penrite synthetic oil. Being an older 2.8 diesel I only have the non variable turbo and am down about 60nm of torque compared to you guys, plus and this is a bonus I have the vacum operated EGR valve which I have had blocked for the last 8,000-10,000klms total klms travelled is 135,000 (89,000miles). Recently it has gotten cooler 40-80 Fahrenheit from morning to midday but when I leave work I am noticing alot of blackish smoke when I take off for the first 10-15 minutes but after that no smoke, this I find normal cause the KJ isn't warm enough but the increase in turbo lag that goes with it is a concern. Also today there was delayed engagement of Drive when I went to leave work (kind of sounds like the faulty filter problem with drain back problems but this has been a once off event), I checked the fluid level, all good but the dipstick was sitting rather high and not seated into position, so maybe that had something to do with the delayed engagement. Transmission service was only done about 8,000miles ago and no problem since then.

So my question is since this is my first winter with EGR blocked off is this normal? If not could it be glow plugs, spilt CAC hose (mine only has a smear of oil on the top hose) or a torques converter starting to fail (I have a rattle that I have chased from day one which was about 60,000 miles that I believe to be in the torque convertor/transmission or a loose engine mount but everyone says it is fine, only rattles in drive and reverse can't say I have heard the rattle whilst in neutral).

Any help would be great as you guys over on that side of the world seem to be more interested in your diesels than the guys and sites from Australia.

Who knows maybe it is just a JEEP thing, thanks in advance

Damo

Glend · **Posted:** Mon Jun 29, 2009 6:39 am

I see Damo. Have you looked at your Boost Control Sensor (aka MAP to the US guys) lately? When was the last time you cleaned it? I'd start eliminating possibilities by cleaning that. BTW that transmission dip stick jumping up is pretty normal, mine does it too. I think there was a post here on that sometime back. I just push it back down. Good luck, I'll be watching with interest.

damo4runner · **Joined:** Wed Aug 01, 2007 7:07 am **Posts:** 100

Yeah Glend I did clean that sensor when I first noticed it happening and usually make sure I do it before every 10,000klms so it was last done about 2,000klms ago maybe smidge more

Uffe · **Posted:** Mon Jun 29, 2009 8:57 am

When cold the engine probably doesn't get as much juice as it does when hot. Turbo lag is the time it takes the turbo to spin up, with less juice into the cylinders it will take longer time for the turbo to spin.

Nice model year you've chosen there

gmctd · **Posted:** Mon Jun 29, 2009 11:45 am

The rattle is gonna be the one-way-clutched alternator pulley, specific to these engines - replace it and if any remaining rattle can be the serp drive belt tensioner\pulley - occurs at only at idle, lower the idle rpm (as in DRIVE\REVERSE), the greater the rattle

Delayed engagement is usually one-way valve in cooler-return filter, the small round can

Smoke\turbo lag -
- check your vacum pump for 25"HG at idle and 2000rpm
- could be leaky ozone-deteriorated vacuum hose(s)
- could be dirty\deteriorated solenoid on the vacuum manager\reservoir
- could be dirty air filter: engine gets more fuel\advance at cold-start, less as ECT gets up to operating temps

damo4runner · **Joined:** Wed Aug 01, 2007 7:07 am **Posts:** 100

Well I think it has to be something cause I was beaten off the line by a Scania dump truck this arvo as the KJ just sat there when I put the foot down only crawled slowly then BIG BLACK smoke screen to the cars behind and off we go. Once again only when cold but yeah I notice the turbo lag still more than I used to even when warm. Just a question how do I "check the vacum pump for 25"HG at idle and 2000rpm". Sorry for sounding dumb "gmctd" just threw a whole lot of woohoo over my head bar the dirty air filter part :oops:

Thanks again

linewarbr · **Posted:** Tue Jun 30, 2009 8:53 am

Does that Model Year of CRD have a variable-vane turbo? It sounds to me like if it does, then the vanes are stuck in the high-speed position, requiring more RPM from a stop to spool up than if the vanes were operating correctly. If I'm not mistaken, the vanes are opened and closed by a vacuum system, thus gmctd's suggestion to check the vacuum pressure. Also take a close look at the small filter connected to the vacuum solenoid, in our North American CRD's it is behind the airbox. If you look behind the airbox lid, it hangs down, and looks like a in-line gasoline (petrol) filter for a lawnmower.

Check out this thread gmctd did for an up-close and personal look at the turbo from the '05-'06 model year CRD's. Compare his to your turbo to determine a difference.

http://www.lostjeeps.com/forum/phpBB3/vie ... hp?t=30576

gmctd · **Posted:** Tue Jun 30, 2009 1:45 pm

Automotive vacuum guage on the hose going from the reservoir solenoid to the engine - crank the engine, check the guage readings at idle and 2000rpm - if good, reinstall the hose to the solenoid - remove the other hose, attach the guage, same test - if same reinstall that hose, remove the other end at the reservoir, check there - same, reinstall that hose, remove the hose from the wg solenoid, check with the guage - same, reinstall that hose, remove the hose from the wg actuator, check there - should be less because the ECM regulates vacuum to the wg based on engine loading

Uffe · **Posted:** Tue Jun 30, 2009 3:24 pm

Turbo on the 2003 model is a wastegate design not a variable thingy. I had one, I should know (if I don't then there's something up with my old one running around with no vacuum hose going to the turbo

)

linewarbr · **Posted:** Tue Jun 30, 2009 3:57 pm

Well, I'm no diesel expert, by far. But I'm learning. . .

Uffe · **Posted:** Thu Jul 02, 2009 3:06 am

linewarbr wrote:

:oops:

Well, I'm no diesel expert, by far. But I'm learning. . .

No reason to be ashamed there, you couldn't have known this stuff because the 03s didn't make it to the US

Anyway it does seem odd why they didn't put a VNT turbo into the CRDs while they made them after 2001. My fabia has a VNT and it's a 2001 design as well...

All diesel experts. What could the problem be?

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