Shudder on Cold Start 2.8 TD 4M40T

dblancer · Post by **dblancer** » Tue Aug 14, 2007 10:53 pm

Hi All

just procured myself a 94 SWB Pajero, so just new to this forum.
Anyway I noticed my Pajero has a really noticable "shudder" when I start it on cold nights or mornings. The previous owner notified me of this, he would just idle for a minute or so before continuing.

I noticed the ext temp is usually 1-2 degrees or lower when this happens.

However the engine shudders are quite violent, if I apply just a small amount of throttle, it warms up in 40 seconds to a minute and stops doing it.

Any idea what is causing this? Im new to diesel engines so Im not sure if Im looking at fueling? diesel pump or my glow plugs nurked or what.
A push in the right direction would be awesome.

Im looking at getting the haynes manual just to give me a better overview of my truck.

thanks!

NJV6 · Post by **NJV6** » Tue Aug 14, 2007 11:03 pm

I would suggest glow plugs. The 4M40 seems to quite like 'eating' glow plugs so I've read. They are easy to test by whipping out and giving them some power in the top and earth the side (thread). They will glow red hot quickly if working properly. I have been told they are only run on 6 volt but I have always tested them briefly on 12 volts.

Cheers, NJ

NJV6 · Post by **NJV6** » Tue Aug 14, 2007 11:05 pm

By the way - the Haynes manual is quite good although I have heard the ozzy's reckon the gregorys one might be better. There is alot of irrelevant 1st generation stuff in my Haynes.

H2OLOVA · Post by **H2OLOVA** » Wed Aug 15, 2007 9:44 am

Agree Glowplugs are more than likely buggered. It might not be all of them so when you do the test make sure you check them all.

Steve_t647 · Post by **Steve_t647** » Wed Aug 15, 2007 10:05 am

Snap with the above two.

What is happening is it is starting on 3 cylinders untill the heat builds up in the head from the ones around it working right. Far less of an issue in warmer weather.

dblancer · Post by **dblancer** » Wed Aug 15, 2007 10:22 am

What is happening is it is starting on 3 cylinders untill the heat builds up in the head from the ones around it working right. Far less of an issue in warmer weather.

That actually makes alot of sense. Whats the best way to test?, using one of the truck batteries and some leads or something lower current?
I imagine these glow plugs arent overly expensive, is this a repco/supercheap purchase? or a mitsubishi part purchase...

Ive had petrol engines for too long!

thanks for your advice NJV6, I have ordered a gregorys manual from a place in canterbury, taking a chance with the gregorys manual for $65 bucks. Best part is i guess its only about the generation 2!

H2OLOVA · Post by **H2OLOVA** » Wed Aug 15, 2007 10:55 am

The glow plugs screw into the head. So its easy to remove them. To test them you can use any wire or jumper leads. Earth out the body of the glowplug and place the positive to the top (you'll know what i mean when you get them out :wink:

) Don't hold them anywhere near the base cause if they are working they heat up real hot, real fast :shock:

The glow end of the plug should "glow" (read get red hot) within about 10 seconds. You'll soon know if they're working or not. Pretty sure most glowplugs are around the 20-25 dollar mark each to buy new.

NJV6 · Post by **NJV6** » Wed Aug 15, 2007 11:02 am

You will need to take the intercooler off. It is quite simple, 4 10mm bolts and two big pipes and some plugs to unplug on the firewall which operate the electric fan that drags air through the intercooler.

Goose · Post by **Goose** » Wed Aug 15, 2007 11:05 am

I've got a similar problem with the lux, but I wouldn't say it shakes "violently", just more than it should :wink:

But dont go to mitsi for parts!! I went there for a temp sender for a NZ new 2.5TD, $76.00 later.... :shock:

It wasn't even gold plated!!!! :roll:

Thrupp · Post by **Thrupp** » Wed Aug 15, 2007 11:14 am

to do it for about 40 seconds is quite long. would it not be warm by then? Our last truck that did that had very low compression in 3 cylinders.....

Mark

dblancer · Post by **dblancer** » Wed Aug 15, 2007 11:33 am

I dunno apparently the size of the engines mean they are quite a big heat sink, so take a few moments to heat especially if you are relying on other cylinders to the heat up a forth... with a naff plug.

Trucks starts very well in normal weather and even in cold, just shudders for a short duration when cold after starting. No problems when warm.

***Went down to repco and got a plug...$49!! a little pricey perhaps :-p thought that sounded like mitsi prices again....had a toyota for quite a while..***

Steve_t647 · Post by **Steve_t647** » Wed Aug 15, 2007 3:15 pm

you need high current to get them warm I think they are not fused in the Hilux. Best bet is to pull the back first and work forward (they get easier with more room and the ones at the firewall end fail first from my experence (well it is a place to start anyway) and if you are in a dark gge you will see the glow sooner...

Anyway you will find you need gloves to handle them after they have warmed up so having somewhere to leave them a couple of min is good. I have one diesel one petrol, most of the tome I drive the petrol quieter

NJV6 · Post by **NJV6** » Fri Aug 17, 2007 1:47 pm

$60 for the set. :wink:

http://www.trademe.co.nz/Trade-Me-Motor ... 24.htm?p=5