[Mk2] [NA] Need advice,car driving me mad

Anything and everything to do with mechanical issues with your Mk2

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JOHNM400
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[Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Ive got a Rev 1 N/A with a Rev 3 N/A engine conversion. The car has never been used on the road since the conversion. I just cannot get the emmisions down. The CO reading is about 7 with the engine warm.

Everything looks to be connected up right other than the fact im almost sure i should have a Lambda sensor on a Rev 3 and ive not. The only wire i can find that looks like a lambda sensor would connect up is a little triangle shaped plug with 3 wires in it. My only concern is that if i buy a sensor and fit it in the exhaust will it work if the ECU is still the original Rev 1 ECU? The guy who changed the engine said he didnt think he had changed the ECU.

If this is the case,would i be better trying to wire in a remote idle speed mixture adjustment device like the REV 1 has instead of the O2 sensor? But then,the idle speed seems a bit too high as well so i would have to fit the Rev1 manifold and throttle body to allow idle speed adjustment. Will the throttle body off a Rev 1 fit direct to the Rev 3 inlet manifold?
ci_newman
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by ci_newman »

I may be wrong, but I'm almost positive that a rev3 engine will need a rev3 ECU. Bigger injectors and no AFM etc will mean that the fuel / air mixture is all wrong for the engine...

And yes, you should have a lambda sensor fitted (At least my UK rev3 does).
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Thats what i was thinking. Strange thing is the car starts and runs ok other than the CO being too high.

Would you by any chance be able to get me the part number of your ECU so i can check it against the part number of the ECU that is fitted to mine?

Also,if you could have a look at the plug where the lambda sensor plugs into the loom and either get me a pic of yours or describe it?

Cheers,John
cantfindausername
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by cantfindausername »

The Rev3 injectors are only bigger on the turbo. The N/A should be the same across all revisions. And the rev1/2 N/A doesn't have an AFM. You're thinking of the turbos there.

If I were you I would get the part number off your own ECU and take your chassis details to your local Toyota. Tell them you want a price for a new ECU and get them to check the part numbers. If they match you still have the rev1 ECU.

I would think also that you need to swap the ECU out for a rev3 N/A one. The engine produces different power figures to the Rev1/2, but this could be down to head/cam design rather than differences in the ECU.

Maybe try the parts breakers or even some breakers yards to see if you can locate a rev3 ecu. breakeryard.com i think would also be worth a try.

The emissions like yours defo suggests that its got no o2 sensor when it should.
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Doc
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ECU

Post by Doc »

Heres a pic of my Rev 3 NA ECU, ITS ON E-BAY AT THE MO SEE LINK BELOW:

Image

http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... &rd=1&rd=1

Heres a pic of my rev 3 lamba sensor but ive sold it already sorry:

Image

Image


PM me if you want the ECU or bid directly on e-bay :)
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Thanks very much for taking the time to reply guys.

Doc,PM sent!
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Well,im getting an even bigger headache now. My ECU is deffo different to yours doc so we know that whoever changed the engine didnt change the ecu.The big problem now is the rev 3 ECU has 4 plugs and mine only has 3. Seems like they didnt change the engine loom either then.

Only thing that baffles me now is surely there should be plugs on the rev 1 loom that dont fit the rev 3 ancillarys and sensors? Also the fact that the rev 1 has a cold start injector and the rev 3 doesnt surely means i should have a plug hanging loose which i havnt #-o Im pretty sure there are other things that shouldnt match up?

Doc,do you have a rev 3 engine loom by any chance? Also some close up pics of a rev 3 engine bay would be good so i can try and compare bits.
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Still need help with this guys. Need rev 3 engine loom,ecu and o2 sensor
Lewis Jay
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by Lewis Jay »

Give these guys a ring they have a few Rev 3 N/A`s layin around.

http://www.internationalcarspares.co.uk ... el&id=2460

Or better still go and ask if you can have a look around there yard for some "interior trim" its amazing what falls of cars and lands in your pocket without people seeing. :-# :whistle: :thumleft:
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

Lewis Jay wrote:Give these guys a ring they have a few Rev 3 N/A`s layin around.

http://www.internationalcarspares.co.uk ... el&id=2460

Or better still go and ask if you can have a look around there yard for some "interior trim" its amazing what falls of cars and lands in your pocket without people seeing. :-# :whistle: :thumleft:


Cheers pal,not far from me either :thumleft:
pcp

Re: [Mk2] [NA] Need advice,car driving me mad

Post by pcp »

just out of interest, did you do the conversion yourself or did you pay a garage to do it?
JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

No i bought the car 200 quid already done. Reason i got it cheap was because it was running eye wateringly rich. That was due to the TPS being way out of position. The car is totally mint body wise,just need to get the engine running right. It drives fine and everything but a CO level of 7 and an idle speed of 1100 isnt ideal. Seeing as the rev 3 has no facilty to adjust the idle speed and mixture it looks like the only way forward is to fit the rev 3 ecu and full engine loom.
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by cantfindausername »

Easier option might be to refit a working rev1 engine and sell the rev3 lump. :-k
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JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

cantfindausername wrote:Easier option might be to refit a working rev1 engine and sell the rev3 lump. :-k


this is what i thought but then i got another headache thinking about it. Rev 1 surely has different loom with differnt connectors for stuff like the cold start injector which the rev 3 doesnt have. So why have i not got spare plugs hanging in my engine bay now if the loom has not been changed?

grrrrrrr :-k
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by cantfindausername »

Are there any "fresh" looking bits of the loom where things might have been cut off and re-taped?
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JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

No mate,doesnt look like its been altered,all looks original. I asked the guy i got it off,he said his mechanic didnt change the loom or ecu. Beginning to wish i hadnt bought the car now,its so frustrating. I spent a couple of hundred on new rad,new windscreen and steering rack already so i really need to find some way of sorting the engine out now. doc has agreed to sell me the rev 3 ecu so thats one less thing to worry about i suppose. As i said the car is mint bodywise,one of the nicest original MK2s ive seen but im really losing faith in ever getting it running perfect.
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by cantfindausername »

Have faith mate, these things are just a case of getting to the root cause of the problem.

I've spent all day trying to get a "No" button to work :lol: and it still aint working!! Works in Firefox, but not in IE. :mad:

I also spent 2 months trying to get a clutch to work when I was rebuilding the engine on my car. Had to completely remove the engine after having it running and strip the box off etc. You will get there in the end. Just gotta tick off all the potential issues as you go along.
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JOHNM400
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by JOHNM400 »

cantfindausername wrote:Have faith mate, these things are just a case of getting to the root cause of the problem.

I've spent all day trying to get a "No" button to work :lol: and it still aint working!! Works in Firefox, but not in IE. :mad:

I also spent 2 months trying to get a clutch to work when I was rebuilding the engine on my car. Had to completely remove the engine after having it running and strip the box off etc. You will get there in the end. Just gotta tick off all the potential issues as you go along.


Well cheers for that pal,the problem is paying money out for new parts and not knowing if they are going to cure the illness lol. I got the rev 3 ECU sorted now off doc.Once i get it ill have to try get to a breakers and have a look at an original rev 3 install and see whats what with the wiring and how it differs to mine.

Just another thing,how hard is it to swap the engine loom over? I wouldnt think it was too hard and was just a case of routing the loom around various parts of the engine and plugging in at the fuse box.
Lewis Jay
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by Lewis Jay »

Just thought of an easy way to tell if the wiring has been changed.

Check the gearbox for the speedo sensor if it has a cable on it its still rev1 if it has wires on it its rev3. :thumleft:

This then posses another problem if you do need to do the loom and ECU co`s you will need to get these working once you swap to rev3 electrical speedo. :-k
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Re: [Mk2] [NA] Need advice,car driving me mad

Post by cantfindausername »

Yeah thats pretty much what it is. But you'll have to remove certain bits to get to things like the injectors and what not.

Paying for parts is always a kick in the boobs. But its a case of biting the bullet. During my build I bought many many parts that either didn't solve the problem, wasn't the right thing, or became surplus due to a change of plans. I wouldn't like to add up the cost of those parts. #-o ](*,)

If I stumble across any pics of rev3 engines I'll post them up here for ya. :thumleft:
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