bad miss/stumble
bad miss/stumble If anyone can help me out that would be great. I was driving on the highway and hit a medium sized bump nothing ultra crazy and the engine stumbled pretty bad for a second. Then after that every small bump made the car stumble. smooth roads no problem car has full power and is perfect. bumpy roads no good at all. engine light is on and showing 3 codes:
P1635
P0530
P0107
thanks for any help.
P1635
P0530
P0107
thanks for any help.
in another thread someone showed me a diagram of the 5 volt reference which is tied into all three codes I am getting. the codes are for 5V ref circuit (P1635), ac sensor out of range (P0530), and map sensor out of range (P0107). so if all three of these things are happening does it mean I have a fried pcm or can one bad sensor cause the entire circuit to go out of range? I know how to change sensors but I dont want to start replacing things for no reason either it gets expensive.
it isnt. it hasnt been since i bought the car 4 years ago. the connections are secure but it just kinda sits in that little battery tray. the bolt that is suppose to hold it down doesnt screw in so it may wobble around a bit. it is a fairly new battery though its a year old.
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ok so i couldnt find any loose connections. took it to the nearest gm dealer and they had it for a week and couldnt find any loose wires either. they did say it could be the map sensor or some other wires back behind the manifold but i told them not to start taking things apart because i didnt want to pay all that labor. so any ideas? u guys think i should just buy a new map sensor and see if that works? dealer said it could be the missing EGR or missing AC stuff since its all on the same circuit. my take on it though is that the EGR and AC stuff have been missing or disconnected for at least 3 years now and i have the egr codes deleted through hptuners so how could it be those things?
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TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
If anyone can help me out that would be great. I was driving on the highway and hit a medium sized bump nothing ultra crazy and the engine stumbled pretty bad for a second. Then after that every small bump made the car stumble. smooth roads no problem car has full power and is perfect. bumpy roads no good at all. engine light is on and showing 3 codes:
P1635
P0530
P0107
thanks for any help.
P1635
P0530
P0107
thanks for any help.
it isnt. it hasnt been since i bought the car 4 years ago. the connections are secure but it just kinda sits in that little battery tray. the bolt that is suppose to hold it down doesnt screw in so it may wobble around a bit. it is a fairly new battery though its a year old.
I had this same issue on a friends car, Spend hours trying to figure it out.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
Staging Lane
Joined: Aug 2012
Posts: 63
Likes: 0
From: northwest Illinois
If u have the skills or know someone who does, u can graph/record the values of all 3 sensors and when the car acts up you will be able to possibly see if ur having a voltage spike or signal dropout. Which could narrow down which circuit is the problem. Also u can clear the codes and check to see which code pops up first and or if they all happen at the same time. I would have to guess " having not looked at the wiringdiagrams" if all 3 of theses codes have set the light as a group and share a common ground that would be a good place to start. Also dont rule out an improperly secures battery... when the battery bounces around all the time it can only handle so much now it would have an loose plate or terminal damage internally causing momentarily shorts. So it u have an extra battery around a quick swap will rule it out and is worth the try. Just some tips for you also a diagnostic flow chart would be a good way to go starting with the first code start to finish and so on.
I had this same issue on a friends car, Spend hours trying to figure it out.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
If u have the skills or know someone who does, u can graph/record the values of all 3 sensors and when the car acts up you will be able to possibly see if ur having a voltage spike or signal dropout. Which could narrow down which circuit is the problem. Also u can clear the codes and check to see which code pops up first and or if they all happen at the same time. I would have to guess " having not looked at the wiringdiagrams" if all 3 of theses codes have set the light as a group and share a common ground that would be a good place to start. Also dont rule out an improperly secures battery... when the battery bounces around all the time it can only handle so much now it would have an loose plate or terminal damage internally causing momentarily shorts. So it u have an extra battery around a quick swap will rule it out and is worth the try. Just some tips for you also a diagnostic flow chart would be a good way to go starting with the first code start to finish and so on.
I had this same issue on a friends car, Spend hours trying to figure it out.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
Ended up being a 5-volt reference circuit wire shorted to ground. The wire is in the ECM harness right under the ECM. Pull the ECM and there's a trim screw that holds the fender liner in that should have a rubber cover on it which usually falls off. It may have grounded on that screw.
thanks for all of your help guys. Ive been driving the car every day since my last post. even took it into manhattan over the weekend and considering the roads there arent great, i guess its safe to say the problem is fixed because there were plenty of rough roads and the car drove perfect. thanks again.
