dizzybirdtrane
Member
- Joined
- April 18, 2009
- Messages
- 15
- Reaction score
- 0
- City, State
- Redding, CA
- Year, Model & Trim Level
- '94 Sport 2WD 6Cyl 4.0L
KOEO: 111 111 (system pass)
CM: 332 337 [this varies, the first time I did this test...got both. then I
cleared CM...drove around, got the CEL error as expected
and it only came up as 332]
KOER: 111 111 (system pass)
hey so here's some backstory....
In the process of trying to get my car to pass a California smog test (shiver...), recently replaced some spark plugs and found out that one of the DPFE sensor "vaccuum" inputs (the frontmost) was disconnected from the EGR Tube, I think it's called. Also, both DPFE tubes looked fragile/brittle, so we replaced them with standard rubber vaccuum tubes...looked like their diameter was a bit smaller than what was on there, but they fit well. Car started up fine and actually sounded better now that these were connected. Next we sprayed down the engine with purple power degreaser and hosed the engine down with a hose on the side of the house....not high-pressure. A few days later, started drivin' the car around and like clockword, each time I take it for a spin, between 3-5 minutes of driving and the CEL comes on. The car idles and runs fine/normal at all times regardless of the CEL light.
so yeah, 332 and 337 are definitely part of the EGR system...and it sounds like from what I'm reading, the DPFE is usually the culprit. I'm not sure what to do at this point or how to test.....
Process of elimination seems to be super easy here...any ideas what could have happened? Car was completely fine, all we did was replace the vaccum tubes with brand new ones (albeit I'm pretty sure they're not the "high temp silicone rubber" ones people are saying should be used! They definitely looked like a tighter fit than the other tube(s) as well. Would this different tubing be a problem?), then we washed out the engine compartment.
I've heard people say...water vapor kills this sensor, that it's really sensitive to vapor. As far as I know this sensor is quite old....I've never replaced it or had it replaced in the 4 years that I've had it, to my knowledge. Wondering if maybe somehow water got into these vaccum tubes when we rinsed the degreaser off the engine....but my roommate was baffled because he said we weren't using a high pressure water stream that would really force it's way into sensitive parts. He'd done it many times before on his own car with no problems.
Anyhow, I should probably go check the manuals for this...which ones are specific to this system for diagnosis. Also, where's a good place to look for those specific high-pressure silicone rubber tubes?
Thanks!
Jonathan
CM: 332 337 [this varies, the first time I did this test...got both. then I
cleared CM...drove around, got the CEL error as expected
and it only came up as 332]
KOER: 111 111 (system pass)
hey so here's some backstory....
In the process of trying to get my car to pass a California smog test (shiver...), recently replaced some spark plugs and found out that one of the DPFE sensor "vaccuum" inputs (the frontmost) was disconnected from the EGR Tube, I think it's called. Also, both DPFE tubes looked fragile/brittle, so we replaced them with standard rubber vaccuum tubes...looked like their diameter was a bit smaller than what was on there, but they fit well. Car started up fine and actually sounded better now that these were connected. Next we sprayed down the engine with purple power degreaser and hosed the engine down with a hose on the side of the house....not high-pressure. A few days later, started drivin' the car around and like clockword, each time I take it for a spin, between 3-5 minutes of driving and the CEL comes on. The car idles and runs fine/normal at all times regardless of the CEL light.
so yeah, 332 and 337 are definitely part of the EGR system...and it sounds like from what I'm reading, the DPFE is usually the culprit. I'm not sure what to do at this point or how to test.....
Process of elimination seems to be super easy here...any ideas what could have happened? Car was completely fine, all we did was replace the vaccum tubes with brand new ones (albeit I'm pretty sure they're not the "high temp silicone rubber" ones people are saying should be used! They definitely looked like a tighter fit than the other tube(s) as well. Would this different tubing be a problem?), then we washed out the engine compartment.
I've heard people say...water vapor kills this sensor, that it's really sensitive to vapor. As far as I know this sensor is quite old....I've never replaced it or had it replaced in the 4 years that I've had it, to my knowledge. Wondering if maybe somehow water got into these vaccum tubes when we rinsed the degreaser off the engine....but my roommate was baffled because he said we weren't using a high pressure water stream that would really force it's way into sensitive parts. He'd done it many times before on his own car with no problems.
Anyhow, I should probably go check the manuals for this...which ones are specific to this system for diagnosis. Also, where's a good place to look for those specific high-pressure silicone rubber tubes?
Thanks!
Jonathan
