'91 celica runs poorly after timing belt job

You double checked the timing marks, right? If you have a timing light,
make sure that the ignition timing is correct. Should be around 10 dgs TDC
with terminals TE1 and E1 (I think, or TC and E1, it should say in the
manual) jumped. Also, check the coolant temp sensor and circuit. Maybe you
forgot to plug it back in?

On Wed, 02 Mar 2005 06:45:56 -0500, qslim wrote:
[color=blue]
> You double checked the timing marks, right? If you have a timing light,
> make sure that the ignition timing is correct. Should be around 10 dgs TDC
> with terminals TE1 and E1 (I think, or TC and E1, it should say in the
> manual) jumped. Also, check the coolant temp sensor and circuit. Maybe you
> forgot to plug it back in?[/color]

One of the reasins I don't do my own timing belts is because there is a
special tool 'required' to do it. Well, what we do is we mark the timing
on the crank AND the cams with indelible marker. This way, without the
tool, if one of the springs in the valve train is under pressure and jumps
the cam when you release the belt, you have a reference besides the cam
marks themselves. This is probably what happened (Of course, you mark the
cams BEFORE removing the belt...)

Missing the timing by one toothe either way can wreak havoc! At least twin
cam Toys are Non Interference!

Ryan wrote:
[color=blue]
> I recently bought a '91 celica gt with a 5sfe engine that ran fine but
> leaked like a sieve. No big problem, since I got it for a fraction of
> blue book and figured I could fix it up and still come out ahead. I
> replaced the front crank oil seal, cam oil seal, oil pump o-ring, oil
> pump gasket, and oil pan gasket. While I was in there I put in a new
> timing belt. The problem is that when I start it up now, it runs poorly
> (though still idling at 1000 rpm, which is where it was before), black
> smoke pours out the tailpipe, and the spark plugs are fouled. There's
> also water dripping from the tailpipe at a rate of a drop about every
> two seconds. These are all new problems. I thought I had the cam timing
> off, but the markings on the cam gear and crank pulley line up like
> they're supposed to. I also checked that I had the firing order right.
> I never messed with the ignition timing. Would the car run like this if
> the cam timing was off just a little? What else could cause these
> symptoms? I seem to have gone from a car that ran well but leaked half
> a quart an hour to a car that doesn't leak but also doesn't run worth
> much.
>[/color]


MAP sensor

I recently bought a '91 celica gt with a 5sfe engine that ran fine but
leaked like a sieve. No big problem, since I got it for a fraction of
blue book and figured I could fix it up and still come out ahead. I
replaced the front crank oil seal, cam oil seal, oil pump o-ring, oil
pump gasket, and oil pan gasket. While I was in there I put in a new
timing belt. The problem is that when I start it up now, it runs poorly
(though still idling at 1000 rpm, which is where it was before), black
smoke pours out the tailpipe, and the spark plugs are fouled. There's
also water dripping from the tailpipe at a rate of a drop about every
two seconds. These are all new problems. I thought I had the cam timing
off, but the markings on the cam gear and crank pulley line up like
they're supposed to. I also checked that I had the firing order right.
I never messed with the ignition timing. Would the car run like this if
the cam timing was off just a little? What else could cause these
symptoms? I seem to have gone from a car that ran well but leaked half
a quart an hour to a car that doesn't leak but also doesn't run worth
much.

You double checked the timing marks, right? If you have a timing light,
make sure that the ignition timing is correct. Should be around 10 dgs TDC
with terminals TE1 and E1 (I think, or TC and E1, it should say in the
manual) jumped. Also, check the coolant temp sensor and circuit. Maybe you
forgot to plug it back in?

On Wed, 02 Mar 2005 06:45:56 -0500, qslim wrote:
[color=blue]
> You double checked the timing marks, right? If you have a timing light,
> make sure that the ignition timing is correct. Should be around 10 dgs TDC
> with terminals TE1 and E1 (I think, or TC and E1, it should say in the
> manual) jumped. Also, check the coolant temp sensor and circuit. Maybe you
> forgot to plug it back in?[/color]

One of the reasins I don't do my own timing belts is because there is a
special tool 'required' to do it. Well, what we do is we mark the timing
on the crank AND the cams with indelible marker. This way, without the
tool, if one of the springs in the valve train is under pressure and jumps
the cam when you release the belt, you have a reference besides the cam
marks themselves. This is probably what happened (Of course, you mark the
cams BEFORE removing the belt...)

Missing the timing by one toothe either way can wreak havoc! At least twin
cam Toys are Non Interference!

Ryan wrote:
[color=blue]
> I recently bought a '91 celica gt with a 5sfe engine that ran fine but
> leaked like a sieve. No big problem, since I got it for a fraction of
> blue book and figured I could fix it up and still come out ahead. I
> replaced the front crank oil seal, cam oil seal, oil pump o-ring, oil
> pump gasket, and oil pan gasket. While I was in there I put in a new
> timing belt. The problem is that when I start it up now, it runs poorly
> (though still idling at 1000 rpm, which is where it was before), black
> smoke pours out the tailpipe, and the spark plugs are fouled. There's
> also water dripping from the tailpipe at a rate of a drop about every
> two seconds. These are all new problems. I thought I had the cam timing
> off, but the markings on the cam gear and crank pulley line up like
> they're supposed to. I also checked that I had the firing order right.
> I never messed with the ignition timing. Would the car run like this if
> the cam timing was off just a little? What else could cause these
> symptoms? I seem to have gone from a car that ran well but leaked half
> a quart an hour to a car that doesn't leak but also doesn't run worth
> much.
>[/color]


MAP sensor

MDT Tech® wrote:[color=blue]
> Ryan wrote:
>[color=green]
>> I recently bought a '91 celica gt with a 5sfe engine that ran fine but
>> leaked like a sieve. No big problem, since I got it for a fraction of
>> blue book and figured I could fix it up and still come out ahead. I
>> replaced the front crank oil seal, cam oil seal, oil pump o-ring, oil
>> pump gasket, and oil pan gasket. While I was in there I put in a new
>> timing belt. The problem is that when I start it up now, it runs poorly
>> (though still idling at 1000 rpm, which is where it was before), black
>> smoke pours out the tailpipe, and the spark plugs are fouled. There's
>> also water dripping from the tailpipe at a rate of a drop about every
>> two seconds. These are all new problems. I thought I had the cam timing
>> off, but the markings on the cam gear and crank pulley line up like
>> they're supposed to. I also checked that I had the firing order right.
>> I never messed with the ignition timing. Would the car run like this if
>> the cam timing was off just a little? What else could cause these
>> symptoms? I seem to have gone from a car that ran well but leaked half
>> a quart an hour to a car that doesn't leak but also doesn't run worth
>> much.
>>[/color]
>
> MAP sensor[/color]

That would be my guess, too, and/or the EGR system(if that model has it)

Hi again,

I went back and checked my marks and everything looked fine. Crank
pulley is aligned with the 0 mark on the lower timing cover, cam
sprocket is lined up with the notch in the cam bearing housing. There
is also a dot etched into the bearing housing about 1/8 turn
counterclockwise from the notch, so I tried lining up the hole to the
dot instead of the notch. The engine wouldn't start. I went back with
the notch and the engine starts and runs badly like before. This time I
am sure I am not off.

I never unplugged the coolant temp sensor.

I don't understand what you mean when you say "one of the springs in
the valve train is under pressure and jumps the cam when you release
the belt . . ." How could it jump the cam? If this is the case, how is
it fixed?

I guess the next thing I'll do is check the ignition timing, even
though I don't see how it could have gotten off since I didn't adjust
the distributor. I've been needing an excuse to get a new timing light
since my cousin borrowed mine right before moving to Kentucky.

Ryan