Hey everyone,
I have a pretty much stock 92 LX 5.0. I've always had a slight surge in idle with this car. Never was terrible and would fix itself once the car ran for a minute or two.
A few months ago I started having a problem where the car would run fine and the idle would be fine, but when It'd idle for a while or while I was stopped at a traffic light, the car would randomly and suddenly drop the idle and start running rich. I found a little trick where keeping a little throttle in would stop the problem from happening. Kept doing that until the problem finally went away.
The cars been running pretty good for a month or two now until the other day when i was stopped at a traffic light again. This time is suddenly dropped to about 500 rpm, running terribly rich, barely any power and chugging basically the entire rest of the ride. Now it just does it constantly and is pretty much undriveable.
A while back when I had first had gotten this problem i pulled the codes. Idle out of range, Bap, and both oxygen sensors running lean. I basically ignored the problem until now.
I reset the computer while i changed the bap sensor 2 days ago. Car still ran the same, terribly rich. When i got home i tried pulling the codes again. Koeo ran perfectly. Got a 67 and 81. Tried the koer test. Got the cylinder number. The throttle blipped twice really quick as if the computer was struggling to raise the rpm. After the two quick blips of the throttle, it threw a code 12 and basically froze. Left it running for 10 to 15 minutes after that with it still stuck on 12. No 10 or 11 codes. Not sure what the problem is there. Repeated the above 3 times with no avail.
So I've been following jrichker's guide. Tested the bap sensor wiring. Under 1 ohm from the bap to egr/tps. Under 1 from bap to negative terminal. Under 1 from the self test connector to negative terminal. Also tried the act and ect to bap and that was fine. Cleaned salt and pepper shakers. The next step im going for testing to the computer pins and testing oxygen sensor harness.
I tried a while ago to see if there were any vaccum leaks. Sprayed almost every connection i could see in the engine bay. I know there is one vaccum leak somewhere regarding the AC. AC only blows on defrost. There was a break at the tree on the firewall. Tried fixing it and didn't change anything. Not sure if that would be enough to cause such a terribly rich condition though.
Anyone have anymore advice?
P.S. Smog pump went bad. (Extremely loud noise) Was bypassed with a shorter belt but the entire system is still there.
I have a pretty much stock 92 LX 5.0. I've always had a slight surge in idle with this car. Never was terrible and would fix itself once the car ran for a minute or two.
A few months ago I started having a problem where the car would run fine and the idle would be fine, but when It'd idle for a while or while I was stopped at a traffic light, the car would randomly and suddenly drop the idle and start running rich. I found a little trick where keeping a little throttle in would stop the problem from happening. Kept doing that until the problem finally went away.
The cars been running pretty good for a month or two now until the other day when i was stopped at a traffic light again. This time is suddenly dropped to about 500 rpm, running terribly rich, barely any power and chugging basically the entire rest of the ride. Now it just does it constantly and is pretty much undriveable.
A while back when I had first had gotten this problem i pulled the codes. Idle out of range, Bap, and both oxygen sensors running lean. I basically ignored the problem until now.
I reset the computer while i changed the bap sensor 2 days ago. Car still ran the same, terribly rich. When i got home i tried pulling the codes again. Koeo ran perfectly. Got a 67 and 81. Tried the koer test. Got the cylinder number. The throttle blipped twice really quick as if the computer was struggling to raise the rpm. After the two quick blips of the throttle, it threw a code 12 and basically froze. Left it running for 10 to 15 minutes after that with it still stuck on 12. No 10 or 11 codes. Not sure what the problem is there. Repeated the above 3 times with no avail.
So I've been following jrichker's guide. Tested the bap sensor wiring. Under 1 ohm from the bap to egr/tps. Under 1 from bap to negative terminal. Under 1 from the self test connector to negative terminal. Also tried the act and ect to bap and that was fine. Cleaned salt and pepper shakers. The next step im going for testing to the computer pins and testing oxygen sensor harness.
I tried a while ago to see if there were any vaccum leaks. Sprayed almost every connection i could see in the engine bay. I know there is one vaccum leak somewhere regarding the AC. AC only blows on defrost. There was a break at the tree on the firewall. Tried fixing it and didn't change anything. Not sure if that would be enough to cause such a terribly rich condition though.
Anyone have anymore advice?
P.S. Smog pump went bad. (Extremely loud noise) Was bypassed with a shorter belt but the entire system is still there.