The Mitsubishi Pajero Owners Club®

jaycb · * Joined: 14 Dec 2004 Posts: 13

Hi everyone,

On my 89 pajero 2.5 engine, Im experiencing a delay power response especially when driving an incline road about 20 degrees. I've observed this problem during shifting of gears from 1, 2 and 3. Eventhough I push hard the accelarator pedal the engine doesn't quickly response. It takes 2 to 3 seconds before it will response. On my 1 gear going to 2 gear, the rpm reading is 1800 after shifting it to the 2 gear the rpm reading will start back to 500 then after 2 to 3 seconds it will gradually increases. When I tried to stay pushing the accelarator pedal it will just emits black smoke.

Is there anybody knows what causes this? Is there something wrong with my engine timing and fuel injection pump timing.

Need your help. Crying or Very sad

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Richie · Posted: Wed Dec 15, 2004 11:06 Post subject:

Assume we are talking auto box here, few things to me, is the EGR blanked off, if not do it, look in FAQ EGR.

Has the fluid in the box been changed recently, if not, do it, same thing search.

Give the motor a good service, throw some injector cleaner into the tank, I work on low fuel in tank, maximum cleaner you can afford, run the motor after all this, and it should respond better.

jaycb · * Joined: 14 Dec 2004 Posts: 13

Hi Richie,

Thank you for your quick response.
I'd tried to looked at TRIG url (http://www.pocuk.com/phpBB2/viewtopic.php?t=8434) regarding EGR. But sad to say those pictures does not exist on my 2.5 engine. Is EGR exist on a 2.5 engine that does not have a turbo charger?

With regards to the fuel injectors, I will schedule it to change a new one before end of this year. How about the fuel injection pump, is there a need to schedule it for calibration? Has this something to do with the issue?

Thanks.

jaycb · * Joined: 14 Dec 2004 Posts: 13

Hi everyone!

Any response to my thread? Please...... Crying or Very sad

Thanks

jaycb · * Joined: 14 Dec 2004 Posts: 13

I'm still hoping that there's someone who will give response to my issue.
Let me repeat my questions above.
1. Is there an EGR on a 2.5 engine that has no turbo? If yes, where is that located.
2. With regards to the delay power engine response on my pajero, is there someting to do with my fuel injection pump? If yes, what should be done?

Waiting....... Crying or Very sad

rickladds · Posted: Thu Dec 16, 2004 9:19 Post subject:

Sounds more like the gearbox is slow in changing down - so long as you are getting a decent top speed on a normal road, your diesel pump is ok (generalistaion, but not far off).

Have you tried manually changing down to see if that makes a difference? Also try the A/T "Power" setting, also check the kickdown cable is ok.

Best of luck

jaycb · * Joined: 14 Dec 2004 Posts: 13

hi rick,

Thank you for the response.

Im using a manual transmission. If the gearbox is slow in changing down, is there a need to be repaired? With regards to the decent top speedt, Im not quite impress. At 3000 rpm I've got a speed of 90-100 kph. Is that normal? Do you have any other suspected parts that causes this problem?
Sorry, I've got a lot of questions Laughing

helijohn · Posted: Thu Dec 16, 2004 11:29 Post subject:

Has this started recently and you have noted a deterioration in performance or are you new to the motor? Some of these motors can seem quite sluggish if you are used to more potent vehicles. Richie has summed up most of the usual quick fixes. If you are only getting 60 mph top speed that could be a bit low but with no turbo who knows! Given enough road I could well exceed the legal limit with lots to spare and now and then I get wheelspin at junctions when getting a wriggle on.

jaycb · * Joined: 14 Dec 2004 Posts: 13

Hi John,

Yes, I'm new to the motor and it's my first time to own a pajero.
Based on richie's response, I understand about the fuel injectors. Since this is 15 years old motor I've decided to buy a new fuel injectors. On his response regarding EGR I didn't get it. I'd tried to looked at TRIG url (http://www.pocuk.com/phpBB2/viewtopic.php?t=8434) regarding EGR. But sad to say those pictures does not exist on my 2.5 engine. Im asking again if EGR exist on a 2.5 engine that does not have a turbo?

Thanks John. Smile

rickladds · Posted: Thu Dec 16, 2004 11:59 Post subject:

If it's a manual gearbox - and the power is down, then check the air filter, diesel filter, injector cleaner, and only then the diesel pump.

Basically, any 2.5 without a turbo is going to be slow, but you seem to be saying in your first post that you are changing up at 1800 rpm. The engine doesn't really get going until about 2,500 rpm, and then should pull up to around 4,000. If you let the revs drop too much, you certainly won't be getting the power.

Ivor Green · ****** Joined: 07 Mar 2003 Posts: 1944 Location: Coventry

I have to say it was always my thought that the normaly asperated Shogun / Pajero was very underpowered , and the very reason they put a turbo on it was to improve the acceleration . if there is anyone who has the same vehicle available you migth be able to test it and get a feel for a problem or just normal performance .

helijohn · Posted: Fri Dec 17, 2004 1:05 Post subject:

Ivor is dead right, needs a comparison doing and the non turbo Shogun is always said to be a sluggard. Anyone got an '89 Paj 2.5 then? Help the poor bloke out.

jaycb · * Joined: 14 Dec 2004 Posts: 13

to all of you guys, thank you for being supportive and all the information that you have shared.

this weekend, I'm going to a deisel specialist to do what you've recommeded.

i will update my thread next week for the results.

thanks and God Bless. Wink

nz3500 · Posted: Fri Dec 17, 2004 9:06 Post subject:

Hi. I do not know how a 2.5 normally aspirated Pajero engine will perform but from past experience with diesels it will be pretty sluggish. If you are letting the engine revs drop to 500 when you change gear going up a hill then what you are experiencing is exactly what I think you should get. More accelerator will just overfuel an already poor situation and may make acceleration even worse.
Try the diesel specialist but do not leap into anything expensive. Any engine can be improved but what you have is not going to get that much better.
Over here vehicles with engines like yours are called mobile chicanes due to the fact that they travel so slow and so you pass them, if you see past due to the black smoke. Thankfully there are not many left now.
I would try the air and fuel filter plus oil changes first and possibly an injector cleaner.
If you are driving the engine too lightly then that will not be doing it good. Give it a good thrashing. Do not let the revs drop below 1000 and preferably higher.
One question. Do you drive the vehicle loaded or is it empty? If you carry a load then expect a non-turbo's performance to be seriously affected.
Up side of the non-turbo is it should last along time. Provided you do not shoot it first.
Final question. Is it standard non-turbo or has someone removed the turbo?

jaycb · * Joined: 14 Dec 2004 Posts: 13

hi nz3500. i've already done the following --> change air filter, change fuel filter and change oil. and i felt little improvement. the only thing that i did not do is the injector checkup. i'd tried the recommendation of one our m8t rick, changing the gear at 2500rpm and i've observed some improvements. i'm not sure if it is a standard non-turbo engine. before i bought the paj, the records show that the original engine was already replaced.
below is the specs of my paj after i've bought it:
make: mits
series: pajero
type of body: super wagon
motor no.: 4d56-cn1216 deisel
year model: 89