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Help needed to save a 91 from the scrapyard please.

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Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Mon Oct 23, 2017 4:48 pm

Hello to you all I am desperatley in need of some help trying to save a 1991 J reg 2.4i LWB Frontera fro the scrap heap if I can!

We were given it about 4 months ago and it had been sat for about a year but it went through the MOT with no problems suprisingly.

My stepson is a trainee HGV mechanic and he put new pads and shoes on and fixed a hole in the exhaust and for a while she ran ok for our needs.

There was some issues with the fuel pump and the son in law swapped it out with one from another vehicle and all was fine for about 2 months.

We got a new exhaust section from the cat all the way back and all was good but about 2 weeks ago started loosing power and the truck is now pretty much undriveable.

Son in law is now unable to help any more and I am no mechanic but pretty handy with guidance and have acess to tools and a lift ect at the father in laws.

It starts and ticks over fine and no EM light coes on. As soon as you pop it in gear it is really lacking in power and will get up to about 30mph on the flat.

Engine is not getting hotter than expected.

There is oil in the air intake coming from the head breather pipe and it looses a bit of oil but not much always did do. OIl is clean as a whistle.

The exhaust gets very hot and you can hear loud pops and bangs like fuel exploding in the exhaust.

The air filter is clean and newish and the maf is clean and seems to be working as it should.

y son in law thinks the piston rings have gone but there is no issue with coloured fumes.

It seems to get a bit better when warmed up a bit but limping it back home the other day about 5 iles at 30 the exhaust was alost smoking hot.

any help as to diagnosing and fixing the problem would be greatly appriciated as although old and a bit rusty the family has kind of fallen in love with the thing and we would like to keep her on the road.
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Re: Help needed to save a 91 from the scrapyard please.

Postby Retro Pedro on Mon Oct 23, 2017 5:25 pm

Start with the simples first. My two pennies worth is
(a) take the plugs out and check the spark end. Black and oily may be your worst fears regarding piston rings. Then it might be not sparking as it should. White means over heating IIRC. Light brown is good.
Another spark plug test is to remove HT/spark lead one at time to see if it's only running on three or less cylinders.
From there a compression test might be an option to indicate burnt out valves or poor cylinder compression.
Not sure if the 2.4 had a breather hose on top of the rocker cover. The 2 litre C20NE did. The idea was the unburnt gases trapped in the rocker cover could escape through a metal gorse filter and get pushed down the hose back into the sump. The gorse used to get blocked up with oily crud with an effect of potentially choking up the engine top end.
Is the fuel being delivered correctly to the injector rail?
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Mon Oct 23, 2017 5:46 pm

Thanks for the quick response Peter!

A few folks have had a quick gander and there is no discolouration of the exhaust emmisions so they tended to be against the idea of worn rings, I will have a look at the plugs tommorow and see what is what as it's nasty outside right now.

the olny pipe on the rocker is going back into the air manifold and that is where the oil is getting into it?
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Re: Help needed to save a 91 from the scrapyard please.

Postby gregster on Mon Oct 23, 2017 6:49 pm

I am stripping a 2.4i at the moment, that ran fine...Engine is sold, but have all the external stuff as engine is going bare...
Check out the index thread below where pics/reviews from all our past meets can be found!!!!
click here for the SE Events Index/links Thread...see all the reviews and whats coming up soon!

Looks like I'm in trouble with the Mrs's again...
She asked me what I'd most like to do to her body...
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Re: Help needed to save a 91 from the scrapyard please.

Postby kees on Tue Oct 24, 2017 6:04 am

Could one of the exhaust's have collapsed internally causing a partial blockage?
Some people are like Slinkies... not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs
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Re: Help needed to save a 91 from the scrapyard please.

Postby fudge on Tue Oct 24, 2017 8:39 am

The other thing to check is the air hose (from air box to inlet manifold) has not got any cracks on ( if you think it does, electrical tape it and see if it changes it)

Found this on my c20 and ran with very little power
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Tue Oct 24, 2017 11:23 am

Thanks for the suggestions guys.

Air hose looks good but the cat could be blocked and will get it on the ramp when I can drag it over to the inlaws and get it on the ramp.

If the cat is gone I would be happy as will just take it out and pop a straight pipe in it's place.
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Re: Help needed to save a 91 from the scrapyard please.

Postby Retro Pedro on Tue Oct 24, 2017 12:51 pm

Think you can get CAT cleaner for not a lot of money. Might be worth giving that a shot.
From my earlier post, if you have got breather pipes might be worth checking to see if any have blockages. Blocked breather pipes will choke the engine.
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Tue Oct 24, 2017 1:05 pm

UPdate: I just tried the paperclip test a few times and got the code 31 and upon checking the info it came up as the rpm sensor so I tried it again and it had no faults lol.

So it looks like a mechanical problem yes?

what should I be looking for as to the Breather pipes? where are they attached to ect as I said I am not a mechanic.
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Tue Oct 24, 2017 1:15 pm

Another thought I had.

I can't drive for medical reasons so it is the other half, I found out a few weeks ago that redex is only 2 quid in tesco and she has been putting a whole bottle in every time she tops up even if the tank is low and its just a tenner.

Could this have done more harl than good? especially if it comes to a dirty or clogged cat as 26 years of build up could have been loosened and shunted out the back?
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Re: Help needed to save a 91 from the scrapyard please.

Postby fudge on Tue Oct 24, 2017 3:29 pm

Could be a crank shaft sensor on the way out...
Mine went due to the insulation breaking down and earthing out...
Was fun trying to find that problem
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Tue Oct 24, 2017 3:38 pm

fudge wrote:Could be a crank shaft sensor on the way out...
Mine went due to the insulation breaking down and earthing out...
Was fun trying to find that problem


I had considered that Fudgw but nothing came up when I did the paperclip blink test.

Would it not show up until it had gone fully do you know?

I am starting to hope now that all that redex has dragged up some crap from the tank and a new fuel filter might give me hope?
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Re: Help needed to save a 91 from the scrapyard please.

Postby fudge on Tue Oct 24, 2017 3:46 pm

It wouldn't show up but when it gets bad it will start dieing when put under load, was fun getting the duck back when I couldn't go above 2k rpm or the engine would die
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Re: Help needed to save a 91 from the scrapyard please.

Postby nonspeciric on Tue Oct 24, 2017 4:33 pm

fudge wrote:It wouldn't show up but when it gets bad it will start dieing when put under load, was fun getting the duck back when I couldn't go above 2k rpm or the engine would die



Daft question but where is the crank sensor on the 2.5 please mate?
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Re: Help needed to save a 91 from the scrapyard please.

Postby fudge on Tue Oct 24, 2017 7:30 pm

I take it you mean 2.4 not the 2.5....
It should be on the right side (battery side) of then engine, near the bottom , next to the oil pump.
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snorkle
SOA lift
winch bullbar
winch(ramsey pro 8000)
hilift jack mount
waffle boards mounts
jerry cans mount
cb radio
front and rear recovery
darken leanses
8x spot light
rear work light
bucket seat
5 point harness

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