- Thread starter
- #21
Merry Xmas folks.
fz1boxer...I was considering that in the mix as well.
Read some post about some 94 owners having problems with
code 25/26 that was caused by a bad pair valve.
The valve on the pair that is causing me problems is the one closest to the firewall.
I even did a leak test on the intake manifold and couldn't find a leak.
Sure enough when I opened up the pair valve the aforementioned valve
was the dirtiest and doesn't operate smoothly. Since I plugged it no more code 25/26.
Tried to clean the stuck valve but couldn't get it as smooth as the other one close to the fan.
The vacuum line from the pair valve goes straight to a metal T pipe under
the intake chamber which supplies vacuum to the EGR VSV on one end and pair valve on the other end.
The clog was where all 3 meet.
Probably from the carbon deposits from the stuck pair valve and with the leaking modulator contributing to the deposit.
I made sure the valves were closed before I reinstalled the top cover of the pair valve housing.
However the only thing I did to disable the pair was to plug the big hose end by
the air filter housing and the small vacuum hose leading to the pair valve.
You don't hear the gurgling sound anymore at startup and the CEL for code 25/26 stopped.
Immediately after the quasi disabling of the pair I noticed that pickup at wide open throttle is not as responsive.
I have a snorkel and was wondering if that contributes
to the air intake volume while stationary affecting egr vacuum.
I'll remove the hose connecting the snorkel to the air filter housing first and check as it's easy.
Then re-enable the pair and check.
Thanks.
fz1boxer...I was considering that in the mix as well.
Read some post about some 94 owners having problems with
code 25/26 that was caused by a bad pair valve.
The valve on the pair that is causing me problems is the one closest to the firewall.
I even did a leak test on the intake manifold and couldn't find a leak.
Sure enough when I opened up the pair valve the aforementioned valve
was the dirtiest and doesn't operate smoothly. Since I plugged it no more code 25/26.
Tried to clean the stuck valve but couldn't get it as smooth as the other one close to the fan.
The vacuum line from the pair valve goes straight to a metal T pipe under
the intake chamber which supplies vacuum to the EGR VSV on one end and pair valve on the other end.
The clog was where all 3 meet.
Probably from the carbon deposits from the stuck pair valve and with the leaking modulator contributing to the deposit.
I made sure the valves were closed before I reinstalled the top cover of the pair valve housing.
However the only thing I did to disable the pair was to plug the big hose end by
the air filter housing and the small vacuum hose leading to the pair valve.
You don't hear the gurgling sound anymore at startup and the CEL for code 25/26 stopped.
Immediately after the quasi disabling of the pair I noticed that pickup at wide open throttle is not as responsive.
I have a snorkel and was wondering if that contributes
to the air intake volume while stationary affecting egr vacuum.
I'll remove the hose connecting the snorkel to the air filter housing first and check as it's easy.
Then re-enable the pair and check.
Thanks.