To hell with the Hollins interchange manual- Engine swap problem
 

Ok I don't know if anyones going to be able to help me with a bit of advice but here's my problem. I have a 1990 GTU that had a burnt out engine i bought for $350 what a deal huh? Anyway i pulled the engine and put in a 13b from an 86. But now that its in and hooked up when i attach a battery with or without the key in the ignition the engine immediatly begins to turn. So it sounds like somethings not hooked up right somewhere. If anyone has had this problem or has any idea what i could check let me know! This is really giving me grief.

Thanks

Ive been told that its wired wrong between the starter and the soloniod. Is there anything else i should check? And does anyone know if disconnecting the rod for the oil metering pump and wiring it full open will cause problems?

im not sure, but i believe that you cant just swap the engine from a s4 into a s5 ( year of car). i could be wrong, but i believe the guy from rotaryresurection.com has what you need to know (information) on making your swap.

I'm not the guy to ask, but I thought there were quite a few ECU differences from the S4 and s5

"IF you have an 86-88 (s4) car, you need to obtain all 87-88 matching turbo II stock parts for use in the car. IF you have an 89-91 (s5) car, you need to obtain al the 89-91 matching parts for use in your car."

that was a quote from rotaryresurrection.com. I'm not sure if he is just talkinga bout turbo engines, but i believe that its not as easy as swaping out engines between s4 and s5. Im no expert on the matter, but i do advice that you wait for someone more knowledgeable to reply to you post before doing anything else.

How did you hook up the s4 engine,? There are a ton of different things, engine harness, ecu, basically any s5 sensors you are still trying to use, get rid of and replace with s4 stuff. There's other stuff too, (waits for the guru to chime in :D ).

Well regardless it SOUNDS like the problem isn't related to the ecu, it's actually the starter, I had the same problem. The wire that runs from the main starter body to the post, is on the wrong post. It will just spin the starter if it's hooked up to the hot lead. Switch the post that the short black wire is on (if you look at the top of the posts it should be on the right post) and try it again. Please let us know if you did a complete swap (harness and ECU) since they are different, and would definatly be the source of your problem.

[QUOTE]Originally posted by f1blueRx7
Well regardless it SOUNDS like the problem isn't related to the ecu, it's actually the starter, I had the same problem. The wire that runs from the main starter body to the post, is on the wrong post. It will just spin the starter if it's hooked up to the hot lead. Switch the post that the short black wire is on (if you look at the top of the posts it should be on the right post) and try it again. Please let us know if you did a complete swap (harness and ECU) since they are different, and would definatly be the source of your problem. [/QUOTE

I second that motion.

You reversed the circuit for the starter from an initial open circuit to an initial closed one somehow.


disconnecting the rod for the oil metering pump and wiring it full open will cause problems?


Umm, not totally sure but you'd have to think about why mazda made the OMP a variable system instead of just setting it at one continuous position. The omp is not the only component that regulates oil flow. You have a couple of different parts in the eccentric shaft and front cover too.

Personally, I wouldn't do that.

Re: To hell with the Hollins interchange manual- Engine swap problem
 

Yes, it will cause too much oil to be injected into the engine. This will lower octane and make it very difficult to pass emissons as well as lead to considerable build up in the combustion chambers.

You should take the old front cover (from the 90) and put it and the MOP onto the 86 motor.

What engine harness and ECU did you use??? the 90??? Then you have to make the electric MOP work from the 90 motor.