Running rough @ WOT - Toyota Nation Forum : Toyota Car and Truck Forums

celicadawgs · 10-06-2006, 06:52 PM

Hi guys, new to the forum.
OK, so all has been fine with the Celica for a few years now.
94 Celica GT 5 speed 2.2L 145XXX miles

Mods: Aftermarket intake installed about 1-2 months ago

New spark plugs installed 5-6 months ago

I can start the engine and it will run fine @ idle. (doesn't mis) If I give it gas it "coughs" and acts as though it's going to die.. If I slowly open the throttle it will rev to redline just fine, No problems at all. I have to be very gentle on the gas, anymore than 1/3 of the throttle @ idle or 1/2 throttle above 3000 rpms and the engine coughs.
I also notice hearing a sucking noise when goosing the throttle plate. I don't think it's a vacuum leak, just the intake sucking air in. I think this is normal.
Now, If I remove the intake and goose the throttle to near WOT while it "coughs" a puff of white smoke will come out of the intake. My first thought when I saw this was a faulty intake valve, but I don't really think it's mechanical becuase it doesn't mis except when it "coughs." I'm wondering if the fuel system isn't dumping in to much fuel for some reason?? Is this normal with our celicas? Is there a common problem I should start with?? If it's not fuel related what else could cause the problem?? Thank in advance for your responses.

Luckynumber5 · 10-06-2006, 07:39 PM

sounds like your ignition timing is off or your cap and rotor need replacing (do the 94 5sfes have a cap and rotor?) anyway, check and see if you need to replace them.

celicadawgs · 10-06-2006, 08:59 PM

Thank you.
I do beleive it has a distributor. I will check the timing.

Is there anyway to test the distributor to see if it's shorting internally??
I know check the contacts, use a timing gun, make sure all connections, etc are good..

What is the resistance of the coil suppossed to be? Thanks again

thousand_five · 10-06-2006, 09:30 PM

Do a complete tune up too while you are at it, it probably needs it.

celicadawgs · 10-06-2006, 10:29 PM

Ok, I did a search and couldn't find any specs for the coils.

I assume they should change resistance slightly when warm.
If I can't find specs I'll just pull a coil wire and check spark kv.

Luckynumber5 · 10-07-2006, 06:28 AM

if its a cap and rotor then the cap and rotor are most likely corroded and that will cause exactly what you are describing. I doubt the coil is bad so start with the simple before you go testing the coil

hachi-rocu · 10-07-2006, 08:18 PM

it has a distributor (cap, rotor)

celicadawgs · 10-07-2006, 09:30 PM

Well I tested the spark tonight and found that I had a nice hot blue spark. I thought what the hell, I'd pull the cap and check the distributor for corrossion. I found the rotor was pretty corrodded at the tip, so I replaced it. Now I have a red spark that only sparks occassionally. I thought maybe it was a bad rotor, so I exhanced it for another. Same thing. I then stepped on the old rotor and and cracked it, so I can't put that back on.

All I did was replace the rotor, why I went from a good spark, to nearly no spark and no start is beyond me.. Pretty hard to mess up isn't it? Unless I'm overlooking something.

Ok, Once I fix the problem I somehow created I'll be back to square one.. For some reason @ WOT or near it the cylinders fill with fuel. I did this while checking spark (before breaking the old rotor) and the spark stayed a nice hot blue color, no change. Plugs are obviously fouling, but replacing them isn't going to help becuase it's just going to happen again..Which makes me feel it's a fuel issue. For some reason when you goose the throttle and open faster than "gently" it seems like the chamber fills up with fuel..

Injectors staying open maybe?? Intake leak not allowing enough air into the chamber??