GZE CUT OUT

[85SuperGZE]

Originally Posted by tksmr2

I also doubt by replacing the coil, that it would solve this problem. Unless your problem is different than mine.. my 87sc runs good until the ECU learns something (yet to be determined), and then the car gradually bogs.. until the car will not move at all w/o feathering the throttle numerous times. Then reset the ECU by either removing the neg. batt. cable or removing the AM2 fuse from the engine compartment.. then it runs fine for a short amount of time, then starts bogging again,, and gradually gets worse until it won't move again.

If it were just a coil.. then the car would be acting up all the time,, reset ECU or not.

Mine was doing that same thing.....after I would drive about 15mins or so I would come to a light then trouble would ensue. At one point I towed it home with my other n/a, much to the dismay of the mrs., as I made her be the pullie(it was less than 2 miles, thats as far as I got) If I sat there with the ecu unplugged(am2 fuse) for like 10 min.s or so, it would fire back up, rev fine, but only give me a mile or 2 then start cutting out, I never pulled the EFI fuse though, never thought of that. I have now rebuilt the dizzy, replaced EVERYTHING cost me just short of a grand, save for the knock sensor, the "thing" on top of the s/c with the bigger air hoses running to and from it (I think its an ACV), vsv for the fpr, and the bad pulley, still running the n/a one till I save up some money again, and it seems to be fine except a slight "delay" with the s/c, only "kicks" in at higher rpms, did replace the wires AGAIN, another 85.00 bucks, so hoping the delay is with the pulley. So maybe your problem is within all that, MAYBE it was the same symptom as yours, but a diffirent problem. My coil was brand new and was causing, probably the majority of my problems, but I did replace the fuel pump and all those assorted goodies......I'll try and see if I can come up with a solution for yours, as you helped me out ALOT, even if to vent to someone that feels my pain, If we werent so far apart, Id have you over for some beers or vice versa so I can help you out with your ride. If you unplug the acv, does it still happen, and is it just under load while driving, or can you leave it running in the garage, like mine, and it still act up after the allotted time while not driving just revving? For awhile mine would bog/cut out even with the s/c relay unplugged, as running like an n/a, if I stomped it, I could actually kill the engine. Let me know how it goes, and drop me a line if you need anything. I also wanted to add that, if your coil is weak it can run okay till you get on it, as you increase the voltage needed it comes in to rapid of succession to continue continuity and therefore will lead to no spark, but will spark when there is less demand. My old 71 Pontiac did that, I sat there and fooled with the points for months, till some old cat explained it to me like that, and once I replaced the coil it went away......I would run out and buy a coil, but if you have one extra lying around, or swap one in for a few, Id try it......the coil I got for the 2 was like 50.00 bucks and it was an accel yellow.

[tksmr2]

Originally Posted by 85SuperGZE

..If you unplug the acv, does it still happen, and is it just under load while driving, or can you leave it running in the garage, like mine, and it still act up after the allotted time while not driving just revving?


I also wanted to add that, if your coil is weak it can run okay till you get on it, as you increase the voltage needed it comes in to rapid of succession to continue continuity and therefore will lead to no spark, but will spark when there is less demand. ..I would run out and buy a coil, but if you have one extra lying around, or swap one in for a few, Id try it......the coil I got for the 2 was like 50.00 bucks and it was an accel yellow.

I never unplugged the ACV.. so I'm not sure..

I left the car running the garage many times. I never had a problem with idle or reving when NOT under load.

The only things it did more often right before the problem started to be more bogging then hesistating was backfire a few times when I was in reverse years ago.. .. And, then one night I got on it a little,a nd it started doing all sorts of weird stuff.. Like right when it was about to get into boost the car would lean out and I would back off the throttle..then hammer the throttle again, and it would boost fine.. but then hesitate like crazy. That is when the problems started to get even worse, and there was more bogging, etc.



Maybe my coil is weak. I have another coil from an MR2.. not sure if it's an NA coil or a SC coil. But, I'll have to give that a try.

Maybe something with the ECU trying to send a higher signal to the coil after the ECU learns about how the car is running, and my coil can't keep up with the instructions, thus not working correctly.. who knows.. but I'll try it.


History of my car is :

87 na auto. converted to 87 SC 5spd with C-52 trans

Bought with 59k back in 1994

Now, ~105k.. and got the gze out of an 85SC swap car that was running w/o an intercooler, and had a no boost problem

The gze had around the same mileage as my 87, so that worked out good in that sense. and we never found out why it wasn't boosting.. but it boosted after we put the engine in my 87.. and dind't have the bogging problem until about 1.5 hours on the way back home from the engine swap.. and it started to hesitate a little when pulling out in 1st gear.

[85SuperGZE]

Hmmmm, I wonder if the intercooler is the problem, it is the right ecu(gze)? Yea it is, I remember you saying that you tried diffirent ones......have you ran it without the intercooler, as well? What is the gain, or draw back to not having a i/c? Is the intercooler in good condition, maybe it has a crack in it somewhere......I checked mine with a shop vac and soapy water(made it blow instead of suck) the hose fit perfectly to the i/c and I clamped it on there, I would cover the open end of the i/c and turned the vac on and off every few seconds and see if there were bubbles forming anywhere. Make sure its dried out on the inside if you do this, I made sure by blowing through the i/c with an electric leaf blower. Just a thought.....Did you check to see that you are getting spark during this problem? Like I did in the other post. Could it even be an OVER boost problem? Or is that considered lean out? I am stumped other than that.

[tksmr2]

Originally Posted by 85SuperGZE

Hmmmm, I wonder if the intercooler is the problem, it is the right ecu(gze)? Yea it is, I remember you saying that you tried diffirent ones......have you ran it without the intercooler, as well? What is the gain, or draw back to not having a i/c? Is the intercooler in good condition, maybe it has a crack in it somewhere......I checked mine with a shop vac and soapy water(made it blow instead of suck) the hose fit perfectly to the i/c and I clamped it on there, I would cover the open end of the i/c and turned the vac on and off every few seconds and see if there were bubbles forming anywhere. Make sure its dried out on the inside if you do this, I made sure by blowing through the i/c with an electric leaf blower. Just a thought.....Did you check to see that you are getting spark during this problem? Like I did in the other post. Could it even be an OVER boost problem? Or is that considered lean out? I am stumped other than that.

No.. not the intercooler. .. I bought a good used one before we even put the motor into my 87, and had that pressure tested.. and everything is how it should be now. Yes.. it is the correct gze ecu for sure.


I'll just try another coil.. or buy a new one.. I think that may be what it is.

[Kevin mr2 1985]

hey if the O2 sensor is not plugged in can that screw with how the motor runs?

[tksmr2]

Originally Posted by Kevin mr2 1985

hey if the O2 sensor is not plugged in can that screw with how the motor runs?

sorry.. but maybe you should start another thread since your question has nothing to do with this thread.


Short answer to your question is 'yes'

[Kevin mr2 1985]

well someone talked about it on the first page of the thread.

[85SuperGZE]

Originally Posted by tksmr2

No.. not the intercooler. .. I bought a good used one before we even put the motor into my 87, and had that pressure tested.. and everything is how it should be now. Yes.. it is the correct gze ecu for sure.


I'll just try another coil.. or buy a new one.. I think that may be what it is.

I'd like to hear if it works for you, I know youre busy with the mk2 though. I did use a n/a coil, until my replacement came in yesterday, and it worked fine, Ive been driving the car alot last 2 days, well alot as in its been about 70 miles, and hadnt had any problems, KNOCK ON WOOD, I shouldnt have said that, as I have errands to run today and plan on driving it.....now just saving money for the NST pulleys, might as well, it sure is slow with that n/a pulley on there, I almost cant wait......though I am tired of working on it, I had been in and under that car so much lately my girl swears it's more of a girlfriend then she is.

[85SuperGZE]

Ant update tksmr2?

[mr2tim]

I changed to a 87 N/a coil on my 89 S/C recently in a pinch with no change in the car. The Toyota OEM #'s were different on each. Kinda makes ya wonder?

Originally Posted by 85SuperGZE

I'd like to hear if it works for you, I know youre busy with the mk2 though. I did use a n/a coil, until my replacement came in yesterday, and it worked fine, Ive been driving the car alot last 2 days, well alot as in its been about 70 miles, and hadnt had any problems, KNOCK ON WOOD, I shouldnt have said that, as I have errands to run today and plan on driving it.....now just saving money for the NST pulleys, might as well, it sure is slow with that n/a pulley on there, I almost cant wait......though I am tired of working on it, I had been in and under that car so much lately my girl swears it's more of a girlfriend then she is.

[85SuperGZE]

I noticed that as well, so I keep em around as back-ups......maybe there isn't a diffirence in voltage ratings, just ran a diffirent part number?

[tksmr2]

Originally Posted by 85SuperGZE

Ant update tksmr2?

No.. I barely have enough time for my MK2.. barely.. I'm one of those people that have too many cars.. and they really require a full time job for each of them.

Maybe this weekend I'll mess around with my MK1 for a bit.. Atlteast get it started up, and wash it.. then replace the coil with this other one I have lying around.

[85SuperGZE]

I heard that, as I too have multiple cars, all 1st gen mr2's (4) and a '71 Pontiac Catalina two door, my grand dad left me when he passed, it needs to be restored, I had a spread sheet of what 2 I did what to, but my computer took a dump, and I couldnt get it back, now I keep a paper trail and all receipts instead of scanning them in. And the '71 keeps getting pushed back further and now it's been 10 years, so that has to be next. Well like to hear when you get it up n running, this Tuesday I should be sending out for my NST pulley's, if nothing rears its ugly head for me to dump more miney into.......cheers.

[mr2tim]

Hey Bro, how's that fractured cranshaft tip, the new crankshaft key and the pulley working out for ya?

That same condition cost me $400+ by the time everything got fixed.

[85SuperGZE]

Well put in a new crank key, the shaft itself was never fractured, the pulley was, running an n/a pulley till I can order the NST kit Tuesday, but so far so good, havent had any problems with anything else

[85SuperGZE]

Seeing if you've had any luck with the 1st gen 2 tksmr2.........

[tksmr2]

Originally Posted by 85SuperGZE

Seeing if you've had any luck with the 1st gen 2 tksmr2.........

No.. won't be for awhile... I'll post here if I do figure it out.. or get around to it.. who knows when.. I keep saying next week, next month, etc..

[85SuperGZE]

Just ordered my pulley set from NST, cant wait!!!, Still runnin smooth.....any update on yours tksmr2, just wondering, as you were a big help to me and I sure appreciate it. I also have extra parts now, in good working order, as in the fuel pressure reg, and efi resistor pack, let me know if you need anything, I wont charge YOU. Take it easy, talk to you later,

[tksmr2]

Originally Posted by 85SuperGZE

Just ordered my pulley set from NST, cant wait!!!, Still runnin smooth.....any update on yours tksmr2, just wondering, as you were a big help to me and I sure appreciate it. I also have extra parts now, in good working order, as in the fuel pressure reg, and efi resistor pack, let me know if you need anything, I wont charge YOU. Take it easy, talk to you later,

Great.. thanks..

Well, unfortunetly.. some really bad news. I'm going to have to sell some things off my MK1 so that I can afford an engine for my MK2. Found out that I have an oil leak at the head, and it's pretty bad. So, instead of fixing that.. I'm just going to get a GEN3 motor which is big money.. but I like to do things the right way, or not do them at all. So, I won't be fixing my MK1 this year.

[85SuperGZE]

Thats a drag.......well if you want to get rid of some stuff, I still would like to have an original crank pulley, so let me know what you would like for it, and see if I can get some money together, as this thing has cost me about 1500-1700 now so let me know, like giving my money to a good cause(MK2 is a good cause!!)Good luck!