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MK2 engine in a Mk1 - idle problems

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daneboy28
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MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Sun May 13, 2018 11:42 pm

For reasons of cost and convenience (hah!) I replaced the knackered engine of my 1996 (P) MK1 1.8 with that from an early MK2 1.8 (V). I've kept the MK1 ECU and loom and replaced the sensors on the new engine with those from the old engine - MAF, throttle body + TPS and ICV, EGR, CAS and a new alternator. It starts and seems to be ok above 2,500 rpm (ballpark figure) however the idle was largely non-existant:; what there was was very lumpy and would only last about 20 seconds at most.
I've tried setting the base idle, which seemed to involve winding the idle screw almost completely out (this can't be correct?) as well as the idle stop screw. Incidentally there appeared to be no difference when connecting GND and TEN and not in a good way. The diagnostic LED flashes codes 10, 11, 13 and 14 - any ideas, as not all of these are covered in the various code tables.
I've also swapped the MAF sensor and the complete throttle body (TPS & ICV) and tried spraying the various hoses with carb cleaner. The only response to this seems to be at the EGR valve. At first I thought this may have been the gasket, but after replacing that I then discovered that just spraying carb cleaner onto the top of the valve body had a similar effect - I can't see why though?

Any help with the above much appreciated!

Btw I have aSummit Racing switch to fit at some point to activate the VICS on the intake manifold; but that's another story...

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Re: MK2 engine in a Mk1 - idle problems

Postby Mazda Mender » Mon May 14, 2018 6:25 am

Have you swapped out the whole thing? as in engine,loom,ECU,sensors and inlet/TB.
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 .
Mk 1 Eunos 90 1.6 soul red ..f/ build
MK 2.1/4 Blue V.S Roadster 1.8 99 ..
MK1 1.8 ,white import.. (Ashleighs)
MK1 1.6 yellow J ltd import.f/build
MK 1 1.8 black Tokyo Ltd..f/build


http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Mon May 14, 2018 11:02 am

The engine, gearbox and inlet manifold are the Mk2 items, the ECU, loom, sensors, TB and airbox are all from the Mk1.
This was on the basis of previous advice that suggested the electricals stay with the car...
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Re: MK2 engine in a Mk1 - idle problems

Postby Mazda Mender » Mon May 14, 2018 3:13 pm

So how have you wired in the crank sensor and Cam sensor....
M-m
The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 .
Mk 1 Eunos 90 1.6 soul red ..f/ build
MK 2.1/4 Blue V.S Roadster 1.8 99 ..
MK1 1.8 ,white import.. (Ashleighs)
MK1 1.6 yellow J ltd import.f/build
MK 1 1.8 black Tokyo Ltd..f/build


http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Mon May 14, 2018 6:29 pm

I've fitted the CAS from the Mk1 (along with the Mk1 cam cover). I believe there's wiring for a crank position sensor on the engine block but the Mk1 ECU/loom does not connet to it.
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Mon May 14, 2018 10:35 pm

I've put the cam angle sensor and cam cover from the Mk1 onto the Mk2 engine. Although I believe there is a crank position sensor on the Mk2 engine, there is no provision for it on the Mk1 loom/ECU. (At least, that is my understanding!)
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Re: MK2 engine in a Mk1 - idle problems

Postby Mazda Mender » Tue May 15, 2018 6:59 am

The Disclaimer:-
This post is a natural product made from recycled electrons. The slight variations in spelling and grammar enhance its individual character and beauty and in no way are to be considered flaws or defects, the articles/answers/comments are provided for information purposes and they are not intended to substitute informed professional advice, I or mazdamenders.net cannot personally be hold responsible for any damage occurred from following this procedure or any injuries from it. Proceed at your own risk.


Mk 1 Eunos 93 black V.S II 1.8 ,
Mk 2 .1/4 Roadster 99 black & gold V.S 1.8 .
Mk 1 Eunos 90 1.6 soul red ..f/ build
MK 2.1/4 Blue V.S Roadster 1.8 99 ..
MK1 1.8 ,white import.. (Ashleighs)
MK1 1.6 yellow J ltd import.f/build
MK 1 1.8 black Tokyo Ltd..f/build


http://www.mx5oc.co.uk/ http://www.mx5nutz.com/forum/ http://miata.net/ http://www.autolinkuk.co.uk/
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Mon May 21, 2018 2:06 pm

Interesting thread, thanks. I now suspect that what I'm seeing may be a four digit code instead of a two digit one despite it being the NA ECU. In my case it would now read as 0134, which is a fault with the O2 sensor. This would perhaps explain the strong smell of petrol from the exhaust and concurrently the rough idle.. :think:
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Mon May 21, 2018 5:08 pm

Thank you for the link, some interesting info. I'm now wondering whether I have a 4 digit code rather than a 2 digit, in which case the diagnostics suggest 0134, which is an O2 sensor fault. This would perhaps explain the smell of petrol from the exhaust along with the other idle issues..? :think:
It is still the NA ECU fitted though.
daneboy28
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Re: MK2 engine in a Mk1 - idle problems

Postby daneboy28 » Wed May 30, 2018 10:32 pm

One step forward... One step backward. At least I'm now convinced it's a 4 digit error code.
I replaced the O2 sensor with a new one from Doctor MX, reset the diagnostics and gave her a few turns around the block. The engine holds the idle but only just; tickover is around 1100rpm but still very lumpy. It will also hunt a bit, eg at start-up it'll go to 2000 for about a minute before settling back.
Intriguingly when I jump the TEN and GND there's no difference to the idle rpm, only the fan comes on. I now have diagnostic code 1170, which indicates that the O2 sensor is giving a fixed return only.

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