2tc Problem, Help!!!!

[jovan]

Hi, this is my first post...ever. I wanted to see if anybody can help, and I really appreciate it if you can. This is going to be a long story, but I'll try to cut it down. I have a 1976 Corolla 2TC SR5 liftback. My dad was the original owner and it only has 75k on it, so it really means a lot to me to get this car running again. About a year ago, I came up to a stop and the car died. It wouldn't hold an idle. Anything below about 2500 rpms and it felt like it was out of time. Anything above and it ran perfect.

 

I checked my idle screw and it was fine. then I checked and replaced all of the vacuum lines. It still didn't fix it. I couldn't really tryto check the timing because of how bad it was running. Then I moved on to the carb. I changed the fule filter and had the carb rebuilt. After putting the carb back on, the car ran PERFECT! I timed it (10 BTDC), and it even idled perfectly at 850rpm. This lasted one day. The very next day, the same thing, I came to a stop, the car died. It ran like poop below 2500 rpms again and would not keep an idle.

 

I nursed it home, checked all my lines...nothing. I replaced the plugs. I replaced the wires. I checked all the connections. I pulled the carb, and had someone else rebuild it. The exact same thing happened. It ran great for one day (ran it for like 3 hours, starting, stopping, all over the town). Same result, ran like poop the next day below 2500 rpms.

 

I checked the points, and replaced them. I replaced the cap, then the rotor. Then I replaced the entire distributor, then the coil, then the resistor, then the ballast resistor, even the ignition module. Then I dropped the fuel tank and cleaned it out (it really wasn't dirty at all). I flushed the lines from the back to the front, front to the back. I replaced the fuel pump about 4 years ago, so I pulled it out and tried a leak down test on it to make sure the diaphram was still good. It was. I pulled the distributor back out, made 100% sure I was timed at TDC. Nothing helped. I got pissed and let the car sit for a few months (...and I was broke from spending all the $$).

 

About a month ago, I figured that since it ran great twice after playing with the carb (Aisan model 26353), that maybe some tiny particles were clogging one of the ventricles. I sent my carb out and had it professionally rebuilt, dipped, cleaned, etc. I just got it back and tried to put it on. First off I noticed that one of the gaskets was not the same as the one I previously put on from the rebuild kits I earlier used. Also noticed that there were 3 gaskets in the box and I can't figure where the third one goes. I made the mistake of not marking my vacuum lines the last time I pulled the carb off, and now I'm not 100% sure that I have them hooked up correctly (although I've tried them 20 different ways). The car won't run at all now. I can get it to fire for about 3 seconds, then it shuts off. :jamie: :jamie:

 

I guess I'm asking if anybody out there has any ideas that I might have missed or am I doomed to take it to some shady mechanic who might charge a forture to chase my corolla's ghosts? Also, does anybody have a detailed vacuum line diagram they might be able to send me? For some reason it is not in either of the original manuals I have and the pic under the hood is pretty faded. Please help!!!!! Thanks for reading my novel!

[Raven]

Sounds like you have a vacuum leak. Did you change the inlet manifold gasket? Have you run a compression test?

 

Thats about all I can suggest for now.

[love ke70]

its definately vacuum leak, probably on the face of where the carby bolts up seeings as it stops when you put the carb back on but then starts again.

make sure its a new gasket and both surfaces are nice and flat

check all gaskets subjected to vacuum.

 

where are you located? this one sounds like fun....

[jovan]

its definately vacuum leak, probably on the face of where the carby bolts up seeings as it stops when you put the carb back on but then starts again.

make sure its a new gasket and both surfaces are nice and flat

check all gaskets subjected to vacuum.

 

where are you located? this one sounds like fun....

 

 

I was really thinking that it has to be a vacuum leak somewhere, but every time I rebuilt/removed the carb, I used new gaskets (and the mating surfaces are very clean). It's driving me crazy! I could try and replace the intake manifold gasket. I haven't tried that yet. When I had the car running, I tried spraying carb cleaner around the intake manifold to see if I could find any leaks...no luck. I'm in North Carolina, stationed here at Pope Air Force Base.

[jovan]

Sounds like you have a vacuum leak. Did you change the ? Have you run a compression test?

 

Thats about all I can suggest for now.

 

 

I really appreciate the help. No i haven't changed the inlet manifold gasket. I will give it a try. I tested the compression about 6 months ago and it was pretty uniform and within specs. I'll order the gasket today and see if it helps.

[love ke70]

have you got a pic of the car/carby?

does it have all those vacuum hoses and emissions shit?

coz it could be one of those....

shame your so far away, can't come n have a look :jamie:

[love ke70]

what carbs are on this motor?

if they are those bloody mikunis or solexs throw them into a plane bound for bagdad and wack something like a 32/36 webber on

[jovan]

have you got a pic of the car/carby?

does it have all those vacuum hoses and emissions shit?

coz it could be one of those....

shame your so far away, can't come n have a look :jamie:

 

 

I'll get a good pic of it today. Yeah, it's got tons of vaccum lines, but no real emissions to it. Its an Aisan model 26353 (2BBL). I'm picking up the intake gasket today, and I'm just going to try and start from scratch again. So many vacuum lines though!

[jovan]

Here's a couple pics of the carb and one of the car

[love ke70]

do you have a diagram for the vacuum lines? if not your not gonna get very far, may have to try track one down...

i don't think my one for my 4k ke70 is gonna be the same....

 

 

is the carby tuned properly?

 

also another thing to try is there may be some shit stuck in the jets that makes it run like shite. try revving the motor up and then jamming your hand over the throat of the carby to create massive vacuum and draw the shit out...its worth a try...

[trd]

have you tried the fuel shut off valve, make sure you have 12V to it & when you disconnect it the engine will run really bad or not at all (under 2000rpm)

[jovan]

have you tried the fuel shut off valve, make sure you have 12V to it & when you disconnect it the engine will run really bad or not at all (under 2000rpm)

 

yeah, I actually replaced it when the car first started to run like crap. The one in the pic is brand new. It's my factory carb in the pic, but I just got it back from getting it professionally rebuilt/tuned/and cleaned. I'm about to head outside right now to replace a few gaskets. I'll check to make sure I'm even getting 12v it.

[jovan]

also another thing to try is there may be some shit stuck in the jets that makes it run like shite. try revving the motor up and then jamming your hand over the throat of the carby to create massive vacuum and draw the shit out...its worth a try...

 

 

I can barely make out the diagram from the sticker under the hood (but it's crappy...and VERY confusing) For some damn reason it isn't in the factory manual!! I was hoping someone would read this and happen to have a good vacuum diagram for a 2TC... The carb is supposed to be properly tuned. The rebuild company I just got it back from tests them on before they send them out..and mine did smell a bit like gas when I got it back, so I'm assuming that it's tuned in pretty close (or at least close enough to start). I'm about to go work on it right now. If I can get it running, I'll try your idea about cleaning the carb out. Thanks!

[Nattwood]

Hey, I know this thread is a bit old, but I was just doing a bit of research on the 2tc online and google brought me to this forum. Anyway, I have a ta22 with the same motor, had a few problems like this with it cutting out at lower revs. Wondering if you ever found the source of the problem, mine seemed to be the vacuum advance diaphragm.