[Maddogul]

Hello
Does somebody know the exact diferencies between the MHA and the MHB variant of the 1.7 engine??
Waiting for an answer ASP
Kind regards Radu

[YOG]

I think they have different engine management and emission control systems:
MHA - EEC V:
http://vehicle.me.berkeley.edu/mobies/powe...t/EECVp3-4.html

MHB - EOBD
http://www.autodiagnostech.com/admin/upload/12112090.pdf

[Maddogul]

Hmmmmmmmm
Both have eecV as engine management
Both Have OBD (
My question is simple
1 have 2 engines 1 MHA 1 MHB
I want to swap the MHB in the MHA place using MHA engine electric loom, MHA exhaust maniflood and catalizateur and 1 Hego senzor, MHA ecu + key and so on, MHA gear box
Is that all i need to do?
Kind regards Radu

I think they have different engine management and emission control systems:
MHA - EEC V:
http://vehicle.me.berkeley.edu/mobies/powe...t/EECVp3-4.html

MHB - EOBD
http://www.autodiagnostech.com/admin/upload/12112090.pdf

[dave208]

How do you find out which one you have then ???
Im just curious, is there any difference ?

[Maddogul]

You have a code on the engine that's first
Then MHA has 1 hego sensor and analog dials
The MHB has 2 hego and digital dash
I want to use all MHA loom gear box and so on on the MHB engine

Kind regards Radu

How do you find out which one you have then ???
Im just curious, is there any difference ?

[happy-kat]

not quite true

you can get one hego on digital dash

[mattpendle]

not quite true

you can get one hego on digital dash

Yeh, that's the setup I have, glad you said that!

[YOG]

This is the info from the Crypton website, page 34:
Model Variant Engine Code Years System
Puma 1.7 MHA 1997-on EEC V
Puma 1.7 MHB 1999- EOBD

http://www.cryptontechnology.com/acatalog/...List%203.30.pdf

This post has been edited by YOG: 29 November 2008 - 09:59 PM

[Maddogul]

Hmmm
I understand but my question still remains
Does the MHB works on MHA ecu,loom,gearbox,exhaust maniflod
all the sensor are he same isn't it?
Waiting for a word from you all
Kind regards Radu

[Maddogul]

So anybody i have to do the conversion on saturday and i need to know
Offcourse i'll post the results
Kind regards Radu

[Maddogul]

So the mistery has been solved
If you want to change an MHA engine with an MHB engine but to keep all from the MHA you need
MHB engine with or without gearbox
MHA engine loom both parts
MHA fuel rail including MHA injectors
MHA water cooling block the one below the coil
MHA catalitic converter with exhaust maniflood and 1 HEgo senzor
MHA ecu
MHA key and PATS
MHA millage conector
So basicaly i put an MHB engine in a MHA car keeping all MHA wirring
Everithing work engine started at half key
My friend is very happy me also :D:D:D
Work time ~ 20 Hours with a full service making all fluids and filters changed
Kind regards Radu

[happy-kat]

thanks for sharing, good information to add to the Wiki

[Maddogul]

Glad to contribute to your Wiki since i learned and i still have to learn a lot from you guys
Cheers with an ice cold lager from Romania
Radu over and out for tonight

[BOK]

This is the info from the Crypton website, page 34:
Model Variant Engine Code Years System
Puma 1.7 MHA 1997-on EEC V
Puma 1.7 MHB 1999- EOBD

http://www.cryptontechnology.com/acatalog/...List%203.30.pdf

If mine's registered 2000 and built 1999 it could be either

[alerno]

Glad about your change. May I ask you: I have a different problem. I don't know if my car is MHA or MHB (I bought it in Germany, registered in April 2000). How can you physically tell/see an MHB engine from an MHA? Apparently here in Catalonia I am not allowed to drive it (environmental emissions) if it is MHA. I thought it was the same engine simply adding two lambdas, one in front one behind of the catalyst,

Any info would be gold.

Maddogul, on 08 December 2008 - 09:52 PM, said:

Glad to contribute to your Wiki since i learned and i still have to learn a lot from you guys
Cheers with an ice cold lager from Romania
Radu over and out for tonight

[Ian G]

The MHA/MHB designation forms part of the engine number marking

http://www.pumapeopl...image&img=10471

The engine is largely similar but the second lambda plays a part in the emissions as it monitors the efficiency of the cat - without it the cat may fail and you would not know. With it you will get an engine management light and P0420 catalyst efficiency fault code.

Post the VIN if you have it, it can also be checked on build date.