6G Celicas Forums

K guys so its been months now and my celica is still down on power. I've had other people who have had 6th gen st's drive it and they say the same. Like I stated earlier in the thread my friend advanced the timing almost all the way to get the thing operating normal or at least semi-normal. However there is still a noticeable power loss and I'm having trouble diagnosing it. I'm over at my friends house and we are going to vacuum test it tomorrow as well as retard the timing back to factory to try and trace the problem. If you guys have any suggestions as to what else might cause the power loss it would be greatly appreciated.

The following have been ruled out:
spark plugs(replaced)
spark plug wires(replaced)
fuel filter(replaced)
injectors(do not contain water)
No check engine light or other idiot lights so NO code to diagnose
Distributor has no water and appears to be working fine

Thanks again guys

has there been any other work done. did it just randomly one day decide to not have any power? was there any major maintenance done on it around the time that it started actin up? i.e. timing belt, water pump, oil pump..... blah blah. does the exhaust tone sound normal? like does it sound like a subaru? (it may sound funny but i had a buddy throw a rocker on an sr20 on the intake side and it sounded exactly like a boxer engine, this resulted in a bent valve by the way). does it pass a compression test?

timing.

I read fuel filter but not fuel pump

You should listen to this guy.

Sorry guys. Little back story. Took the car to the carwash. Pressurewashed bay (grocery bag over dizzy etc. Left the carwash and had subbie sounding celica so I pulled over and one of the connections on the dizzy from the spark plug wires had gotten knocked loose. Ran fine home. Let car sitt for a couple of days and went to go somewhere and boom subbie celica(firing was off). Checked the spark plug wires resistance and one was bad so I got new wires. Checked the dizzy, injectors, changed plugs and wires but have had problems ever since. I don't think the fuel pump is bad. Have not done compression test but that is soon. Car us pulling vacuum and no vacuum lines are missing. Thanks. Hope this helps. Its been underpowered for months. With the distributor advanced all the way it fires normally but retarding the dizzy will make it subbie celi once again.

Sorry guys. Little back story. Took the car to the carwash. Pressurewashed bay (grocery bag over dizzy etc. Left the carwash and had subbie sounding celica so I pulled over and one of the connections on the dizzy from the spark plug wires had gotten knocked loose. Ran fine home. Let car sitt for a couple of days and went to go somewhere and boom subbie celica(firing was off). Checked the spark plug wires resistance and one was bad so I got new wires. Checked the dizzy, injectors, changed plugs and wires but have had problems ever since. I don't think the fuel pump is bad. Have not done compression test but that is soon. Car us pulling vacuum and no vacuum lines are missing. Thanks. Hope this helps. Its been underpowered for months. With the distributor advanced all the way it fires normally but retarding the dizzy will make it subbie celi once again.

my 7GC did went Subie on me! was the coil on plugs...maybe check the module thing that feeds to the dizzy?

Failing cam position sensor? Bad ECM? Bad knock sensor? Bad MAP sensor? Faulty distributor?

you should replace the cap n rotor.

also you couldve jumped a tooth on ur timing belt..

sorry guys I meant to put that I've already replaced cap and rotor

jumping a tooth may be a possibility b/c I haven't had the timing cover off to check

Just to get a safe answer, pull the cover off...

turn engine till notch on crank pulley lines up wit the 0* mark on the timin cover. pull valve cover off. hole in timing gear should match with notch in camshaft cap behind it

may i know what kind of power loss is it? is turbo boosting correctly? how many psi? or is it an hesitation power loss?

lol no turbo spool at all!

Yeah man sorry no turbo here. Wish we had more gt4's in the states.

will be checking timing by this weekend

Here's a 0-55ish video we took to show how slow it is now. We're pretty sure it slipped timing. So we'll take off the valve cover tomorrow to check like you guys suggested.

http://youtu.be/WpSvCfQJCJ0

That vid actual doesnt help your case any. That performance is about right for the 7a. Idk what kind of performance you were getting before, but anything more than what was shown in the video would not be for a stock 7a.

timing belt off? affecting your ignition timing.

check anything with your ignition as well.

that does sound a bit sluggish and I used to own a 7A with an auto trans.