MA61 motor swap: 5M only running on 3cyl

[ps165]

ive just finished swaping the motor in MA61, its a straight motor replacement, so was nice and easy ..i do have 1 problem though, the motor will only run on 3 cylinders (rear 3)
plugs and leads are all ok. and all lead are getting spark. fuel pump was fine before we took the old motor out (a week ago) anyone have any ideas....?? cheers

[Malcolm]

blocked fuel rail or injectors? Remove the whole rail with injectors still in, crank motor and see if they all spray

[ps165]

replacement motor went fine in last car, but hadnt run in 2-3 months.

blocked fuel rail or injectors? Remove the whole rail with injectors still in, crank motor and see if they all spray

yeh thats a good idea. does it come straight out, or do i need to remove other thing to get to it?

[Malcolm]

I helped a friend with an engine conversion and the motor ran perfectly well in the old car, then in the new one it was only running on 3 cylinders (3sgte). Turned out to be a blocked injector.

The fact that one end of the motor isn't running is why I think it could be a blocked fuel rail. Could also be insufficient fuel pressure.

Anyway I don't know how the fuel rail comes out on a 5M, should be fairly easy though

[Toymad]

ive just finished swaping the motor in MA61, its a straight motor replacement, so was nice and easy ..i do have 1 problem though, the motor will only run on 3 cylinders (rear 3)
plugs and leads are all ok. and all lead are getting spark. fuel pump was fine before we took the old motor out (a week ago) anyone have any ideas....?? cheers

The 5M runs a resistor pack for the injectors and it is an aluminium block with a three wire connector. It mounts on the inner guard and connects to the engine loom in the area of the distributor. It houses two resistors for two banks of three injectors:

http://www.cygnusx1.net/supra/library/T ... E_004.html

It could be a simple connection problem. If not, check the resistance for each resistor - one may have blown......

David

[ps165]

ive just finished swaping the motor in MA61, its a straight motor replacement, so was nice and easy ..i do have 1 problem though, the motor will only run on 3 cylinders (rear 3)
plugs and leads are all ok. and all lead are getting spark. fuel pump was fine before we took the old motor out (a week ago) anyone have any ideas....?? cheers

The 5M runs a resistor pack for the injectors and it is an aluminium block with a three wire connector. It mounts on the inner guard and connects to the engine loom in the area of the distributor. It houses two resistors for two banks of three injectors:

http://www.cygnusx1.net/supra/library/T ... E_004.html

It could be a simple connection problem. If not, check the resistance for each resistor - one may have blown......

David

thanks heaps for that info, i used the loom off the transplant engine and dont remember connecting up the part you refer too, so that could well be the problem i will post on my progress, cheers

[deaf_rattle]

did you put in a cressida 5mge? there are a few differences with those 5mges

[ps165]

did you put in a cressida 5mge? there are a few differences with those 5mges

not went from 1 celica xx to another

[ps165]

thanks for all the suggestions, and big thanks to Toymad!!! it indeed was exactly what you described, the problem lay in the plactic connectors, one of the spade terminals had been pulled halfway out resulting in there being no caontact between the 2 wires very simple to fix. now i can get it out of the workshop and finnaly get some pics.