6G Celicas Forums

Sent you a DM. Could use driver's side seat belt and some other stuff.

Jay

I don't know that it's ever been replaced.

No one has any ideas at all??

Hi. Could use some advice. 94 ST Manual rebuilt engine

Previously had CEL with code 071. Replaced ERG valve, EGR modulator, and 1 vacuum hose. CEL fixed.

Went to have car smogged and all emissions are high. Here are the numbers:

15 mph HC=95 CO=0.53 NO=795
25 mph HC=82 CO=0.41 NO=763

Not sure where to begin. Should I just replace both O2 sensors to start and then retest? Any advice appreciated.

Thanks!

Jay

Thanks. I can't imagine there's much difference between the parts since these are mostly just valves with diaphragms. As long as they have the same ports and in the case of the EGR valve, everything bolts on the same, I don't see why they shouldn't work. I'd love to pay the $15 for the modulator rather than the $73 Rock Auto wants for the exact match item.

Thanks for the response. Rock Auto gives 4 different part numbers for these parts, 1 each for the ST automatic and standard and 1 each for the GT automatic and standard. The most expensive one is for the ST manual, which, of course, is the model I have. The EGR modulator is more than twice as much for the ST manual as for the automatic. That's why I was hoping they might be cross compatible.

Bump.

Anyone have any thoughts on this?

Bump.

Anyone have any thoughts?

Perhaps I should have been more specific. I tried to apply vacuum to the EGR valve. I attached the vacuum pump to the port on the top of the valve. In the picture below it's the port sticking straight up off the top of the valve. It would not hold vacuum.

Tried to apply vacuum at the EGR port to test EGR valve. Will not hold vacuum. Does this mean ERG is shot? Anything else to test?

Also, how best to test EGR vacuum modulator?

Thanks!

Have a 94 ST Manual Transmission. Rebuilt 7A-FE engine. CEL pn and throwing code 071. EGR valve doesn't hold vacuum when I apply vacuum to see if engine stalls.

Looks like I need to replace the EGR valve and possibly EGR modulator. I'm wondering if either of these are cross compatible with other models? For some reason both of these are very expensive for this engine and cheaper for other engines.

For example, I've only been able to find used EGR valves for the automatic transmission, not the manual transmission. If I could use the one for the automatic, I can save a bunch of dough. Are these interchangeable even though they have different part numbers?

Likewise for the modulator. I've found aftermarket ones on Ebay very cheap for the GT 5S-FE engine. The ones listed for the ST 7A-FE engine are much more expensive. Anyone know if there's any difference between these or if they're interchangeable?

Thanks for any guidance on this.

Looking for an EGR valve for my 94 ST manual transmission. May also need Modulator.

Located in Los Angeles but will pay shipping within U.S.

Thanks!

bump

I posted this in the Maintenance Forum and was told it was better posted here.

I replaced my manual transmission ('94 ST) with a newer used one. The one I removed had a bit of a scraping noise in 1st and sometimes stuck a little getting into 1st. As I recall it leaked a little too. The old trans is sitting in my garage taking up space. I hate to throw it out if it has some value to someone. It would likely have to be rebuilt which is a project I'm not looking to take on right now. Any suggestions as to whether this is of use to anyone?

So no responses to this? Was it a silly question?

I replaced my manual transmission ('94 ST) with a newer used one. The one I removed had a bit of a scraping noise in 1st and sometimes stuck a little getting into 1st. As I recall it leaked a little too. The old trans is sitting in my garage taking up space. I hate to throw it out if it has some value to someone. It would likely have to be rebuilt which is a project I'm not looking to take on right now. Any suggestions as to whether this is of use to anyone?