I just pulled a stock EA82T out of my '87 SW and put in one that I just put together using a carbed block.

I used the original intake and wiring harness and didn't change anything else either.

The car was running fine a couple of days ago, other than running warm and losing a bit of coolant, which was why I pulled the motor.

The problem now is that it is running way too rich, won't idle propperly or wind past 5000 rpm. CEL is off and no codes. Nothing that controls fuel was even changed. Educated guesses ?

1st guess is that the fuel return and supply lines are mixed. Then maybe the fuel pressure relays lines could have lost the vac hose that it uses for reference?

 

But it did run fine for a while so I don't know. Do you have a vac. reading that it'd be the ticket should be around 18-22hg's i think.

Thanks for the guess. I've already double-checked all of the plumbing and wiring. Everything went on properly. I put 91 Octane in, now it will idle cold, but it surges every three seconds, and will still not rev past 5000.

I'll go through and test each component, maybe I'll find something.Maybe another guess might come along.

check the coolant temp sensor and connector for corrosion. that will cause a rich condition and poor drivability

Timing belts, timing, or plug order...

Thanks for the guesses. I think have found the problem, after checking every connector and hose, and yes, belts too.

It appears that the signal voltage from the TPS is reading 2.4 volts at idle instead of 0.5 .It was a used TPS anyway as are most of the parts I use, but it did test fine about five weeks ago.

I will update this thread once I know for sure, in about two hours.

I had an extra connector put together under the dash and it ran like yours come to think of it. I'll PM Island Roo cause he's the one who found it when I sold him the car.

Well, no such luck. Still running way too rich, and surging every three seconds. It is especially annoying because I changed out the block for nothing, as my persistent little leak turned out to be the lower rad hose.

I didn't touch anything under the dash when I did the motor change.

Any other guesses?

Well, end of day five and still no luck. The belts, every hose and every connector and all of the components have been checked at least twice.

I would just change the motor again, but I would have to use the same intake again, as the '87 is different from the '86 and '88, and it's the only '87 wiring harness I have. I'd hate to waste another day to find out that the next motor acts the same.

All suggestions greatly appreciated. I will post the solution once I know what I did wrong.

jim,

 

sorry to hear your having so much trouble, wish i knew enough about it to help.

I am a little confused about the intake system. Are you using a SPFI intake? If so, then the injector may not be closing properly.

jim,

here's a picture of my toy , before the rebuild ( after a hard landing:banana: lol lol )

it will be candy blue and black. pain in the butt and wallet trying to teach yourself to fly lol l;ol lol lol

I used to dream of flying one of those but after seeing what happened to a couple of them you couldn't pay me enough to go up in one.

Problem solved. Turns out that I somehow lost both grounds to the air flow meter. My ECM was giving no codes other than station identification. I borrowed an ECM from a turbo XT with the identical production date and plugged it on. It gave me the 23 code right away. I dont know why the original did not give the code, but when I started to check the harness, both grounds were open. I just hot-wired both wires to the mounting bolt for the dropping resistor because changing the plug did nothing.

 

I don't know where the grounds run to, but when I have time I will tear a harness apart to find out, for future reference, unless someone already knows?

 

Anyway, the car is running beautifully, and thanks for the help.

Awesome! Those kind of problems can be so frustrating glad you found it. Did you keep the carb C.C. pulley? Can't believe how much lighter they are than the trubo ones.

Okay, we'll try this again. And Ben, I somehow lost your post. I only got to look at one picture. Try again please.

 

Anyway, problem solved. Long story short, wiring harness to air flow meter. Lost both grounds. Jumped them to ground, runs great. Thanks for all the suggestions.

I have tons of pulleys because I never have time to clean up. I built the last motor using a 151 km block, MFPI T heads, MFPI nonT cams and a lot of parts off the floor. Idles a little roughly, but takes no prisoners. You can't hit it in 2WD, not if you like your tires.

 

Problems like mine come along fairly seldom, and I think we have these problems just to humble us up a little bit, we really don't know as much as we thought we did.

 

Cheers, thanks for the input.

 

Ben, I found your post, thanks. I'll give you a call before the weekend.

Thanks for the update. Glad you found the problem.