Lukeyd

Hi all we have fitted a new engine as the old one dropped a timing chain. Story is since the new motor has been fitted the car will start most times with some throttle, it struggles and hesertates to accelerate until the point of it stalling. This issue dose seem to be intermittent as some times it will start and run ok and rev to red line without a problem until it's put in gear then it will bunny hop and carry on. Dose any one know is there maybe a sensor on the flywheel or torque convertor that sends a signal to the computer? We have been through a lot of diaignosing so far without any 100% fix.
We have had it going and moved the distributor a tiny bit and it revs up grate then goes bad once put in gear to move it.
Please if someone with some knowledge of these motors might know where to start and are willing to help us diagnose the problem could help me out it would be very appreciated.

GLENN S.

I'd check the cap and rotor, the rotor burns through the center

Lukeyd

Hi glen and thinks for your input. I just checked what you said and all looks fine. We have used every thing from the original motor that was running fine before it broke the chain. I'm guessing it's a sensor or somthing that dose not want to inter change with the new motor really not sure tho.

Lukeyd

Also when it runs it is very rich with black smoke when you can give it full throttle.

Lukeyd

when it runs it is very rich with black smoke when you can give it full throttle.
Also this is something we have not been able to work out. We have a sensor or somthing with a green wire going into it on near the bell housing it runs to what looks like A coil modulator which I'll put a pic of. We are starting to wonder when you connect the box to the motor is there somthing that has to be linged up so all runs right?
Sorry I can't work out how to upload pics if someone can let me know that would be good to.

Thanks luke

GLENN S.

I believe that's the crank sensor. Also, you mentioned turning the dist. The rotor has to be pointing to no. 1 when engine is on top dead. If you watch the tach when things go wrong, it may indicate a crank sensor issue if it fluctuates when the rpm doesn't.

Lukeyd

Thanks glen. I will look at that tomorrow, I had it going before and reving up fine still a little rough at idle. Most times when I put it in gear it dies and if I can get it to move it is gutless.
So is there any trick for installing the gearbox like dose the fly wheel have to be aligned with anthing at the back of the motor that can give dramas with the crank sensor?

Lukeyd

Do you have any info on how to set the timing? We are fairly sure it's right but we may be wrong

Thanks again

GLENN S.

Generally there's a red paint mark on the dist. screw. Make sure all the grounds are tight. As far as flywheel, I think it only goes on 1 way.
Did you change the C.I.S? Maybe the center pin is stuck

Lukeyd

Thanks glen I will check that. What is the CIS?

GLENN S.

Where you located?

Lukeyd

In country victoria.

Lukeyd

Is the CIS the fuel distributor? If it is yes we have had it rebuilt and that didn't fix the problem. Thanks glen I appreciate your time and knowledge.

GLENN S.

Why not swap the old cis set-up onto the new engine?

Lukeyd

We have done that mate. It's a mystery, as the motor we brought was running all we done was swap them over.

GLENN S.

Possibly a wire broke in harness when moving them around. Old cars and brittle wiring. Don't forget to check the fuel. I did one of those and some nice person put water in the tank. Took me a week to figure that one out!

Lukeyd

Thanks glen, I will check all the above soon and see how we go. Most Likely a wire as it's intermittent. It like somthing is responding when it put in gear as it hops in reverse and in drive just really under powered.

Thanks again

GLENN S.

Ok, good luck, I hate problems like that, when you find it, you'll say - oh crap.

Lukeyd

Yeah they seem to be the simple ones aswell. It's been to a machanic that works on them all the time and he couldn't work it out.

Lukeyd

Hi glen, we have been through most things now. It seems to be running a little better. Still at idle it revs from idle to 1000rpm then back to idle constantly. I can hit the throttle and it's fine revs right up when put into gear it still dose the rev up and down thing. One thing Iv noticed is while it's running if I turn the dizzy a tiny bit it make a huge result in how the engine performs. My past dealings with car last are you can nearly turn the dizzy both ways with minimal diffrance to the way the engine runs.

Have you got any other tips for me?

Thanks again.

GLENN S.

The dist. Is for aligning rotor to no. 1 cylinder for firing. The crank/ flywheel sensor is actually the reference point for the computer. Maybe spray intake and boots with brake cleaner to check for leaks? That lower plenum could have an open port or cracked boot. Also, the throttle switch defective or miss- adjusted? Tap the idle motor while it's doing it or unplug it. Maybe you could send me some pics? I'll PM my email.

Lukeyd

Thanks Glenn
If you want to give me your email it would be easier is I can send some pics and vids.
Really appreciate your effort.

Thanks Luke

GLENN S.

I did, PM

Lukeyd

Sorry glen I have not be able to find it. Will it come to my email or through mb world?

GLENN S.

Your private messages.