L
LarryK 87
Guest
for the last couple of weeks i have been chasing a nagging problem with my idle, on start up the idle is very high 1600+ rpm, thought maybe the Vac. canister selonoid was sticking, so i bypassed it, no effect ( BTW replaced all Vac lines on the engine) there have been no signs of any vacuum leaks else where, I found i could limit the high rev on startup by putting it into flood mode. Last week it learned a new game, AFTER start up ( in flooded mode) if would idle right back where it beloned, i let the engine warm up a bit ( min 100 deg temp) then pull out, Now the rpm as i drive out of the parking lot will, with light throttle, get to maybe 1500 rpm, and refused to drop (a quick blip o the throttle will settle it down again.
So today i decided to pull the TB and really scrub it down, while i was at it i also bypassed the coolant line as well. Now during all this i dropped one of the( actually both ) retainers for the throttle linkage, while looking for them under the car i found a connector of some sort ( with a bracket on it ) just kind of hanging there, with two wires coming off it not connected to anything, the wires look like they have been torn off what ever they where attached to. Now since for the most part the car was/is running ok, so i decided for the time to ignore it. put every thing back togather, hit the starter, and oh man what a differance, prompt, smooth 800 rpm start, clean and solid idled right down to 600.
The good...
Took it out for a bit of a test drive, great in traffic, no stumble no nothing just a rock solid 600 idle in trafic at a stop in gear. so far so good.
The bad...
I have suspected from a few posts here that my trans is going, so a quick drive to the local AAMCO ( nope did not take it there ) turned around started back into traffic with a light throttle and you would have thought the rear end had just lost half it's teeth.
Engine aint idling so good now. Take it to the local Vette place ( 3 -4 mile drive ), his prognosis... Trans is shot ( Torq. converter is what is causing the noise ) and is damaging the trans more every time it does this. Referred me to the shop he sends his trans out to, so off i go. Engine now starts like it used to, High Idle, then calms down ( but no sticking )
The Ugly...
During the drive to the trans shop ( 4-5 miles ) the engine starts running real rough, at stop lights the idle is surging, as i continue the engine gets worse, so i decide to turn around and take it home. Now here is the real ugly part and the question ( finally )
At the next light, the idle is rough ( but not stalling ) and the oil pressure light comes on, idle comes up, light goes off , now at no time did it sound ( or indicate ) the rpm was so low as to drop the oil pressure below the trip point. I pulled into a parking lot put it in park, idle still very rough BUT no oil pressure warning, put it in gear, oil pressure warniing again as the engine surges ( repeated this several times ) Now this only happens with the car in gear and at an idle and never at all while actually moving.
Can The transmmission some how effect the Dash electronics or the ECM to the point of showing an oil pressure warning? ( The Dash was set to display Oil Temp when it first did it ) Typical Oil pressure is 50 PSI.
BTW during the drive home the SES light came on, then whent off when i put it into park in the parking lot, and did not come back on during the rest of the drive home.
So today i decided to pull the TB and really scrub it down, while i was at it i also bypassed the coolant line as well. Now during all this i dropped one of the( actually both ) retainers for the throttle linkage, while looking for them under the car i found a connector of some sort ( with a bracket on it ) just kind of hanging there, with two wires coming off it not connected to anything, the wires look like they have been torn off what ever they where attached to. Now since for the most part the car was/is running ok, so i decided for the time to ignore it. put every thing back togather, hit the starter, and oh man what a differance, prompt, smooth 800 rpm start, clean and solid idled right down to 600.
The good...
Took it out for a bit of a test drive, great in traffic, no stumble no nothing just a rock solid 600 idle in trafic at a stop in gear. so far so good.
The bad...
I have suspected from a few posts here that my trans is going, so a quick drive to the local AAMCO ( nope did not take it there ) turned around started back into traffic with a light throttle and you would have thought the rear end had just lost half it's teeth.
Engine aint idling so good now. Take it to the local Vette place ( 3 -4 mile drive ), his prognosis... Trans is shot ( Torq. converter is what is causing the noise ) and is damaging the trans more every time it does this. Referred me to the shop he sends his trans out to, so off i go. Engine now starts like it used to, High Idle, then calms down ( but no sticking )
The Ugly...
During the drive to the trans shop ( 4-5 miles ) the engine starts running real rough, at stop lights the idle is surging, as i continue the engine gets worse, so i decide to turn around and take it home. Now here is the real ugly part and the question ( finally )
At the next light, the idle is rough ( but not stalling ) and the oil pressure light comes on, idle comes up, light goes off , now at no time did it sound ( or indicate ) the rpm was so low as to drop the oil pressure below the trip point. I pulled into a parking lot put it in park, idle still very rough BUT no oil pressure warning, put it in gear, oil pressure warniing again as the engine surges ( repeated this several times ) Now this only happens with the car in gear and at an idle and never at all while actually moving.
Can The transmmission some how effect the Dash electronics or the ECM to the point of showing an oil pressure warning? ( The Dash was set to display Oil Temp when it first did it ) Typical Oil pressure is 50 PSI.
BTW during the drive home the SES light came on, then whent off when i put it into park in the parking lot, and did not come back on during the rest of the drive home.