GravyDavey
NAXJA Member
- Location
- San Diego, CA
Hello,
I have a 1988 XJ 4.0L AW4, 190k on the odometer. This was an Ohio jeep that I'm now trying to smog in CA.
Here's my issue: It seems that my new EGR valve is causing the motor to stumble under light acceleration from a stop. If I don't let off the pedal or push down harder, the motor will stall. It idles in park without any problem, the problem only comes up when I put it into Drive.
The reason I believe it's EGR related is because the EGR is new, and this problem was not present before I put it in. The prior EGR valve did not function. I quickly tested it several time this evening by plugging and unplugging the vacuum input to the EGR. No stalling when the EGR vacuum is removed, stalling issue present when vacuum is connected.
Of course, this is probably how the EGR is supposed to work, and the real problem is elsewhere. Recently I've completed Crusier tips 1, 2 (actually 27), 3, 5, 6, 7, 8, 9, 10, 11 and 22 (replaced harnesses). EGR valve is new and O2 sensor is new. As I mentioned, I'm trying to pass CA smog. I failed the first time (high NOx). From a tip on this forum, I've put in colder rated plugs (Champion RC9YC) and a 180 stat as well.
I'm hoping to retest this week, but I would like to understand why the engine wants to stall with the EGR connected. Thank you.
I have a 1988 XJ 4.0L AW4, 190k on the odometer. This was an Ohio jeep that I'm now trying to smog in CA.
Here's my issue: It seems that my new EGR valve is causing the motor to stumble under light acceleration from a stop. If I don't let off the pedal or push down harder, the motor will stall. It idles in park without any problem, the problem only comes up when I put it into Drive.
The reason I believe it's EGR related is because the EGR is new, and this problem was not present before I put it in. The prior EGR valve did not function. I quickly tested it several time this evening by plugging and unplugging the vacuum input to the EGR. No stalling when the EGR vacuum is removed, stalling issue present when vacuum is connected.
Of course, this is probably how the EGR is supposed to work, and the real problem is elsewhere. Recently I've completed Crusier tips 1, 2 (actually 27), 3, 5, 6, 7, 8, 9, 10, 11 and 22 (replaced harnesses). EGR valve is new and O2 sensor is new. As I mentioned, I'm trying to pass CA smog. I failed the first time (high NOx). From a tip on this forum, I've put in colder rated plugs (Champion RC9YC) and a 180 stat as well.
I'm hoping to retest this week, but I would like to understand why the engine wants to stall with the EGR connected. Thank you.