The Mitsubishi Pajero Owners Club®

[Mordue22]

Hi there, could do with some help please, new to pajeros and diesels for that matter! My paj has no heater plug light on dash (don't think it's ment to, 2.5 on a 93) so ive been trying to listen for relay clicks and seems to be clicking on and off within in a split second! Needless to say there's not enough delay to heat up plugs so it's a bit sluggish to start in mornings and having to use hand throttle! Also got what I think is a diesel leak running down n/s of engine which drips on drive when running from what I think is the pump under intercooler, any insight you may have to these problems would be greatly appreciated! Thanks

[Google]

[Taraswolf]

the 2.5 motor usually has 2 relays/solernoids between the batteries and uses 6.2v glow plugs, sounds like the plugs have been replaced with cheapy plugs at some time and the glowplug ecu doesnt like the plugs so just cliks on/off within a few secs, had the same problem with mine, you have a choice of fitting a decent set of plugs so the ecu will work properly and give the plugs a good few secs to heat up or fit a manual by-pass switch.
The hand throttle isnt a choke btw it just raises the tickover does the same as putting your foot on the throttle.
If you have a diesel leak you need to get that sorted asap as it can cause engine running issues including bad starting, if fuel is leaking out air can get into the system.
Happy new truck btw

[HandyDan]

[Taraswolf]

I have tested different glow plugs and different makes have different resistance as i posted about them a few years ago, and when put on a pajero the ecu fires the relays at different times due to what we think is the different resistance from the plugs hence with some plugs on the 2.5 you get very quick on/off times and bad starting, change the plug to a different make and it changes the timing of the relay, there are many many posts on this forum which state the same problem with the 2.5td 6.2v quick start system and the same answer to rectifying the problem.
Fitting a decent make of plug or use the club shop plugs and this 1-2 sec on/off of the relays goes back to its normal timing and the 2.5 starts fine, if it was a ecu problem changing the plugs would make no difference to the relay timing just by changing a set of plugs.
Problem is when folk buy new plugs they more than likely buy the cheapest plugs they can find and these just do not work properly with the 2.5 6.2v system.
Been there got the T shirt same as many others.

[HandyDan]

[4ePikanini]

I agree with the temp sensor. swap it out and see what happens.

[pajmanAl]

[HandyDan]

[pajmanAl]

[HandyDan]

[Mordue22]

Hi again and thanks for all the replays! Just an update on what I've done today, not much tho as am on night shift, I've noticed today while looking at plugs that the wires to bus bar are connected to the first plug ( nearest to you when looking at them) and sure I've read somewhere that they should be on the third or second from the back which ever way you look at it, anyway it resulted in 1 second longer delay between clicks, as my original post said I was getting nothing between clicks before hand and now I get 1 second, still not efficient I know but every little helps!
Another note to ad is how many wires is ment to connect to bus bar? As there it a single wire which I presume is the live and a double wire which think may be earth but they were both connected to same plug on bus bar, is this correct? Just to me if earth and live are together surely they would trip each other out? ( that's if it is an earth like)
Any help appreciated and I am a novice so feel free to correct me! Could wire a house no probs but auto's still puzzle me lol

[Mark3]

As far as i understand the quick start (twin relay) system the relay operation time in your video is as it should be as its putting 12 volt into 6 volt plugs, hense quick start and no need for a light on the dash. the other relay will apply 6 volt the 6volt heater plugs once the engine is running and it may do thiis in pulses too.

And i cant see no way the heater plug control unit can tell what plugs are fitted as all it does is power a relay UNLESS it monitors battery voltage once the plugs are heating up? but this i doubt very much.

If you have trouble starting i would make sure you have power actually getting to the heater plug bus bar while the relay energises and if it is then fit new 6volt plugs, a neighbour of mine got some from ebay for £20 delivered, they work but i dont know for how long though as they quitr cheap.

[Mark3]

P.S. left relay pre start & suplies 12 volt, right relay post start & supplies 6 volt. i think lol

[OffRoadRob]

My 2 pence worth...

Mine had the exact same issue when i bought it. Thought it must be the ecu, so just fitted a push button and forgot about it. Came back to it a bit later, decided to put some new glow plugs in so sourced some correct 6 volt lucas ones off the eblag and fitted them. Wired up the ecu again as it should be and hey presto it worked perfectly!

Turns out i had 12v ones connected to some sort if resistor pack in it before. Looked exactly like the set of glow plugs that milners list on their website for our trucks, complete with the same resistor pack.

Was the plugs all along. Right plugs made the difference to my truck.

[HandyDan]