91 corvette l98 with rough idle throwing 4 codes
Thread Starter
Cruising
Joined: Dec 2017
Posts: 10
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From: Inola OK
91 corvette l98 with rough idle throwing 4 codes
Hi! New to the forum and just wanting to see if anybody could help. I'm getting codes 32, 44, 45, and 46. I have recently replaced fuel injectors with bosch 3's, my egr valve and lines, my O2 sensor, and my IAC. I've been scratching my head for a while now and any help would be greatly appreciated! 
Team Owner
Joined: Jul 2004
Posts: 28,475
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From: Hartford WI
12 No Distributor Reference Pulse (this code is displayed only when engine is not running)
13 Oxygen Sensor Open
14 Coolant Sensor High Temp
15 Coolant sensor Low Temp
21 TPS Voltage High
22 TPS Voltage Low
23 MAT Sensor Temp Low
24 Vehicle Speed Sensor
25 MAT Sensor Temp High
32 EGR System Error
33 MAP Sensor Voltage High
34 MAP Sensor Voltage Low
41 Cylinder Select Error
42 EST System Error
43 ESC System Error
44 Oxygen Sensor (System Lean)
45 Oxygen Sensor (System Rich)
46 VATS Error
51 Mem-Cal Error
52 Engine Oil Temp Sensor Low
53 System Voltage Error
54 Fuel Pump Voltage Low
62 Engine Oil Temp Sensor High
13 Oxygen Sensor Open
14 Coolant Sensor High Temp
15 Coolant sensor Low Temp
21 TPS Voltage High
22 TPS Voltage Low
23 MAT Sensor Temp Low
24 Vehicle Speed Sensor
25 MAT Sensor Temp High
32 EGR System Error
33 MAP Sensor Voltage High
34 MAP Sensor Voltage Low
41 Cylinder Select Error
42 EST System Error
43 ESC System Error
44 Oxygen Sensor (System Lean)
45 Oxygen Sensor (System Rich)
46 VATS Error
51 Mem-Cal Error
52 Engine Oil Temp Sensor Low
53 System Voltage Error
54 Fuel Pump Voltage Low
62 Engine Oil Temp Sensor High
So we have an EGR code, O2 high, O2 low and a VATS error. Why don't we scrub everything and forget it for now. Where did you get the Bosch 3 from? Did they advise you on the size or did you pick a size?
Here is the thing. People get all bent out of shape on the ECM codes. They are very primitive and I wouldn't bother with them unless there is supporting data that repeats itself. IOW, one code 32 won't bother me. Clear it and if it comes back, that is another story.
FYI, for future diagnostics, get a scanner and not a paper clip or a code reader which is a fancy paper clip with a nice box. Think of it like Quasimodo's sister in a pretty dress.
Thread Starter
Cruising
Joined: Dec 2017
Posts: 10
Likes: 0
From: Inola OK
For future reference.
So we have an EGR code, O2 high, O2 low and a VATS error. Why don't we scrub everything and forget it for now. Where did you get the Bosch 3 from? Did they advise you on the size or did you pick a size?
Here is the thing. People get all bent out of shape on the ECM codes. They are very primitive and I wouldn't bother with them unless there is supporting data that repeats itself. IOW, one code 32 won't bother me. Clear it and if it comes back, that is another story.
FYI, for future diagnostics, get a scanner and not a paper clip or a code reader which is a fancy paper clip with a nice box. Think of it like Quasimodo's sister in a pretty dress.
So we have an EGR code, O2 high, O2 low and a VATS error. Why don't we scrub everything and forget it for now. Where did you get the Bosch 3 from? Did they advise you on the size or did you pick a size?
Here is the thing. People get all bent out of shape on the ECM codes. They are very primitive and I wouldn't bother with them unless there is supporting data that repeats itself. IOW, one code 32 won't bother me. Clear it and if it comes back, that is another story.
FYI, for future diagnostics, get a scanner and not a paper clip or a code reader which is a fancy paper clip with a nice box. Think of it like Quasimodo's sister in a pretty dress.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
I got the fuel injectors from fuel injector connection. They fit the specs of the previous injectors.
I wasn't aware there were scanners for obd1 and will invest in one asap.
I've cleared the codes once but can't remember if it was before or after doing my egr. I've only worked on my 72 chevelle so all this computer stuff is throwing me for a bit of a loop. Thank you!
I wasn't aware there were scanners for obd1 and will invest in one asap.
I've cleared the codes once but can't remember if it was before or after doing my egr. I've only worked on my 72 chevelle so all this computer stuff is throwing me for a bit of a loop. Thank you!
THEREIN is the issue. There aren't that many left since most of them are newer cars and they don't cater to the old stuff. I have a SnapOn MT2500 with the correct modules and will soon be testing out ALDLDriod.
One More Time, Baby. Clear it and make sure there are no codes then drive it till you see something or when it goes into closed loop (maybe 20 minutes continuously). I can't say how long since I just scan it to see if it is in open loop or not but temp has got to be stable operating temp for it to do that. Also it will check if you really have an O2 issue or whether it was just a hiccup. Check timing. Without a scanner, I don't know how to monitor if the O2 is reading right or not other than to hook up a DVOM and see what happens. It should swing back and forth. VATS might be a one time thing only.
Thread Starter
Cruising
Joined: Dec 2017
Posts: 10
Likes: 0
From: Inola OK
Jon has been pretty good with his recommendations so I can take a leap of faith that he has sold you the correct ones.
THEREIN is the issue. There aren't that many left since most of them are newer cars and they don't cater to the old stuff. I have a SnapOn MT2500 with the correct modules and will soon be testing out ALDLDriod.
One More Time, Baby. Clear it and make sure there are no codes then drive it till you see something or when it goes into closed loop (maybe 20 minutes continuously). I can't say how long since I just scan it to see if it is in open loop or not but temp has got to be stable operating temp for it to do that. Also it will check if you really have an O2 issue or whether it was just a hiccup. Check timing. Without a scanner, I don't know how to monitor if the O2 is reading right or not other than to hook up a DVOM and see what happens. It should swing back and forth. VATS might be a one time thing only.
THEREIN is the issue. There aren't that many left since most of them are newer cars and they don't cater to the old stuff. I have a SnapOn MT2500 with the correct modules and will soon be testing out ALDLDriod.
One More Time, Baby. Clear it and make sure there are no codes then drive it till you see something or when it goes into closed loop (maybe 20 minutes continuously). I can't say how long since I just scan it to see if it is in open loop or not but temp has got to be stable operating temp for it to do that. Also it will check if you really have an O2 issue or whether it was just a hiccup. Check timing. Without a scanner, I don't know how to monitor if the O2 is reading right or not other than to hook up a DVOM and see what happens. It should swing back and forth. VATS might be a one time thing only.
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
Team Owner
Joined: Jul 2004
Posts: 28,475
Likes: 3,291
From: Hartford WI
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Thread Starter
Cruising
Joined: Dec 2017
Posts: 10
Likes: 0
From: Inola OK
Thread Starter
Cruising
Joined: Dec 2017
Posts: 10
Likes: 0
From: Inola OK
Also, I hadn't really thought about this, but my oil temp gauge hardly moves, and my coolant temp gauge sometimes shoots up at idle. Then there's the ominous "check gauges" light that's dimly lit. Besides that, I've also learned that before I recieved my car the cats "fell off".😂
Last edited by Chevellibu72; Jun 23, 2018 at 04:46 PM.