Emission problems!
Thread Starter
Intermediate
Joined: Jun 2001
Posts: 41
Likes: 0
From: Breda NB
Emission problems!
I have a problem with the emissions on my '93 ZR-1.
Over here in The Netherlands we have the obligation to have your car checked yearly to see if the car still meets all safety and emission standards. I had my '93 ZR-1 in a couple of days ago and the shop that checked my car called me with a very disturbing message: the car did not meet emission standards, not by FAR! At an rpm of 2500 the CO value is way too high!
I know that my catalysts were 'empty', this was done by a previous owner. However, when the car was imported in The Netherlands a year ago, they were already empty and the car DID pass emissions then. The shop who sold me the car said that was not strange: the LT-5 is a relatively clean engine that can meet our standards without catalyst.
Today however I was confronted with my engine having a CO of 8 while it has to be 0,4 maximum. That is a VERY large gap between these two values! In my opinion there is something wrong with a sensor, resulting in bad mixture of fuel and air with combustion.
I also had an occasionally "Service engine soon" light the last few weeks for this checkup and the shop told me it was a code 32.
Could this point to the EGR valve not working correctly?
If not, what could cause this? Wrong fuelpressure or another mixed up sensor?
Over here in The Netherlands we have the obligation to have your car checked yearly to see if the car still meets all safety and emission standards. I had my '93 ZR-1 in a couple of days ago and the shop that checked my car called me with a very disturbing message: the car did not meet emission standards, not by FAR! At an rpm of 2500 the CO value is way too high!
I know that my catalysts were 'empty', this was done by a previous owner. However, when the car was imported in The Netherlands a year ago, they were already empty and the car DID pass emissions then. The shop who sold me the car said that was not strange: the LT-5 is a relatively clean engine that can meet our standards without catalyst.
Today however I was confronted with my engine having a CO of 8 while it has to be 0,4 maximum. That is a VERY large gap between these two values! In my opinion there is something wrong with a sensor, resulting in bad mixture of fuel and air with combustion.
I also had an occasionally "Service engine soon" light the last few weeks for this checkup and the shop told me it was a code 32.
Could this point to the EGR valve not working correctly?
If not, what could cause this? Wrong fuelpressure or another mixed up sensor?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Emission problems! (Cenobyte)
Sounds like the EGR system is the problem. Check the vacuum lines to the valve and electrical connections to the servo and from the temp sensor. If all is well you need to service the EGR; the problem is most likely the sensor or the valve. There is a rather lengthy procedure to isolate the bad element.
BTW, I assume it's about noon there!
BTW, I assume it's about noon there!
