Engine Stalling at Idle - And A Bunch of Codes
#1
Engine Stalling at Idle - And A Bunch of Codes
I usually get about 2-3 weeks without any issues on my 04, then something creeps up. Well, now it has developed a little hard starting, idle winds up, then comes back down to under 1k, then just drops and dies. Checked the codes and got a whole mess of them:
Given the codes listed, where should I start first? I'm a little lost on this one.
Thanks
- P0414 - secondary air injection switching valve A
- P0445 - EVAP purge control valve
- P0448 - EVAP vent control
- P0102 - Mas air flow A circuit low
- P0340 - Cam position sensor A, bank 1
Given the codes listed, where should I start first? I'm a little lost on this one.
Thanks
#2
#3
I've used MAF sensor cleaner on it previously, but that was months ago before these codes popped up. Would a bad MAF sensor cause other related issues and the other codes? As in, would a bad MAP sensor eventually cause the EVAP codes or the secondary air injector code, or would an issue with one of those drive the MAF sensor to go bad?
#4
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Funkadelic (04-04-2023)
#5
Well, doing more research on the first two codes led me to realize my Disco had the SAI stuff removed at some point by a previous owner. Makes sense why I wasn't seeing a secondary air pump mounted on the passenger firewall area. Looks like two ports coming out of the head on the passenger side are capped off, a couple of hoses are capped at an EVAP/air controller thing on top of the driver valve cover, and the air check valve is removed from next to the passenger valve cover.
I'll go ahead an get another MAF sensor and check wiring diagrams for the EVAP/air controller thing...whatever it's called.
I'll go ahead an get another MAF sensor and check wiring diagrams for the EVAP/air controller thing...whatever it's called.
#6
#7
I'm still struggling to figure out what is going on. Trying to test the MAF sensor operation and can identify two wires with power on, but not sure about the other three. One seems to be the ground, and the other two would be signal to and from sensor. The power wires were reading around 6 volts each...not 12. Once the engine is running, the in/out sensor wires are barely showing .08 to .10 volts and don't seems to fluctuate much when I slowly rev the engine. I thought a noticable voltage change should happen when engine revs.
Once the engine gets up to a higher temp, the idle will drop off and die. Until then, it idles rough. I took the intake off to check the MAF sensor wiring harness and I don't see any kinked or melted wires. I could have been checking the voltage incorrectly...at this point I'm not sure what to zero in on. Any suggestions?
Once the engine gets up to a higher temp, the idle will drop off and die. Until then, it idles rough. I took the intake off to check the MAF sensor wiring harness and I don't see any kinked or melted wires. I could have been checking the voltage incorrectly...at this point I'm not sure what to zero in on. Any suggestions?
#8
Also for got to add...there is no difference in the engine if I have the MAF sensor plugged in or not. I also put in a different MAF sensor, and ran the engine with sensor plugged in and not plugged. No different. That's what was leading me to a possible issue with wiring, but didn't see anything.
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