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Quickstop [UK]
Combating adversyty.
Re: One last shot... Breaking up!
new ign module?
new ign module?
One last shot... Breaking up!
- Thread starter BoostedSUV
- Start date
BoostedSUV
Active member
Re: One last shot... Breaking up!
Took out the 1 year old one MSD ign module and put in a new Accel module along with a new magnetic pick up. My symptoms point towards ign module but I changed it. Unless there is a specific one for a sy/ty and I don't have the correct one?
Took out the 1 year old one MSD ign module and put in a new Accel module along with a new magnetic pick up. My symptoms point towards ign module but I changed it. Unless there is a specific one for a sy/ty and I don't have the correct one?
BoostedSUV
Active member
Re: One last shot... Breaking up!
I was just thinking... Because I never stop thinking and I can't even sleep because of this stupid truck! Even when this issue "went away" for a while I had what I thought was engine vibration around 2500. I remember thinking that I needed to change the balancer or something... Anyways, I'm now realizing that this was just a milder case of what's going on now and this issue has never "gone away" like I thought it might have. More useless info but I will add to the mix.
I want to go back to the basics for a second, I'm questioning myself. I've never installed a ECM controlled elec advance dist before this truck. I've always had mechanical advance units, or units with advance locked out. Now when I installed the Dist in my truck I line the pointer up with TDC, verified I was on the ignition stroke.( Both #1 valves closed), I dropped the Dist in with the rotor point at #1, disconnected the EST brown wire, started truck, set timing to zero, tightened the dist hold down, re-verified I was on zero, shut the truck off and reconnected the brown wire. Pretty basic right? Nothing special with our trucks correct? Just thinking out loud and questioning my own doing at this point.
I was just thinking... Because I never stop thinking and I can't even sleep because of this stupid truck! Even when this issue "went away" for a while I had what I thought was engine vibration around 2500. I remember thinking that I needed to change the balancer or something... Anyways, I'm now realizing that this was just a milder case of what's going on now and this issue has never "gone away" like I thought it might have. More useless info but I will add to the mix.
I want to go back to the basics for a second, I'm questioning myself. I've never installed a ECM controlled elec advance dist before this truck. I've always had mechanical advance units, or units with advance locked out. Now when I installed the Dist in my truck I line the pointer up with TDC, verified I was on the ignition stroke.( Both #1 valves closed), I dropped the Dist in with the rotor point at #1, disconnected the EST brown wire, started truck, set timing to zero, tightened the dist hold down, re-verified I was on zero, shut the truck off and reconnected the brown wire. Pretty basic right? Nothing special with our trucks correct? Just thinking out loud and questioning my own doing at this point.
Windedv6
Ty n 10s
Re: One last shot... Breaking up!
I had a MSD dis go bad several years ago. The pickup magnet ended up having a crack in it. I swore I would never use an MSD HEI billet dis again...but I did. It's been years ago and I don't remember the ohm range on the nagnet to check it. MSD will give it to you if you call them.
John
I had a MSD dis go bad several years ago. The pickup magnet ended up having a crack in it. I swore I would never use an MSD HEI billet dis again...but I did. It's been years ago and I don't remember the ohm range on the nagnet to check it. MSD will give it to you if you call them.
John
thunderace31
New member
Re: One last shot... Breaking up!
What did you set the base timing at?? Maybe its to far or not enough ?? Just a thought :tup:
What did you set the base timing at?? Maybe its to far or not enough ?? Just a thought :tup:
BoostedSUV
Active member
Re: One last shot... Breaking up!
I'm going to verify my TDC mark on balancer but the truck idles at 29 degrees. When I bring the RPMs up (in park) timing rises to 44 degrees which to me seems awfully high! I'm also at 17 degrees or so at WOT which seems normal. What do I know? Nolan the tuner doesn't think anything of it...
I'm going to verify my TDC mark on balancer but the truck idles at 29 degrees. When I bring the RPMs up (in park) timing rises to 44 degrees which to me seems awfully high! I'm also at 17 degrees or so at WOT which seems normal. What do I know? Nolan the tuner doesn't think anything of it...
Quickstop [UK]
Combating adversyty.
Re: One last shot... Breaking up!
29 degrees sounds way off....
29 degrees sounds way off....
midnightbluS10
Banned
Re: One last shot... Breaking up!
I assume you unplugged the tan wire while checking the timing? 29 degrees seems wayyyy off.
I assume you unplugged the tan wire while checking the timing? 29 degrees seems wayyyy off.
BoostedSUV
Active member
Re: One last shot... Breaking up!
29 degrees at idle with tan wire connected? That doesn't seem off to me.... It's at 0 with the tan wire disconnected.
29 degrees at idle with tan wire connected? That doesn't seem off to me.... It's at 0 with the tan wire disconnected.
thunderace31
New member
Re: One last shot... Breaking up!
That to me is way to high I am not sure what base is for these trucks (Still learning) But Id say 10* maybe would be right with the wire disconnected ?
That to me is way to high I am not sure what base is for these trucks (Still learning) But Id say 10* maybe would be right with the wire disconnected ?
BoostedSUV
Active member
Re: One last shot... Breaking up!
Base timing is supossed to be set at 0 degrees with brown wire disconnected. That's what mine is set at. It runs at 29 deg with wire connected at idle
BoostedSUV
Active member
Re: One last shot... Breaking up!
TPS makes sense but I verified the tps percentage as well all voltage throughout the entire randge of motion with a VOM and DataMaster. I also had this issue with a stock TB and I now have a BBK that came with a new TPS.
TPS makes sense but I verified the tps percentage as well all voltage throughout the entire randge of motion with a VOM and DataMaster. I also had this issue with a stock TB and I now have a BBK that came with a new TPS.
WyoSyclone
Active member
Re: One last shot... Breaking up!
Looking at the factory service manuals and at that last log Matt.
Looks like it's boiling down to a couple of issues....
But first a question.... which O2 sensor is wired into the ECM, the factory or the PLX?
It looks like the possibilities could be...
1 - Faulty ECM, or circuit 412 (purple wire at 3-wire O2 sensor connector) intermittent to ground.
2- Fuel pressure (I'm sure you said you checked this as it was stumbling at the different rpm's).
3 - Exhaust leak (pulling raw air into the exhaust can cause erratic O2 readings. Vacuum or crankcase leaks can cause a lean condition - PCV valves good and operating?).
If all above are OK, then it's the O2 sensor.... (this is quoting out of the service manual).
Your O2 mV values are way outside of the nominal range (as stated in the service manual).... plus they are just bouncing everywhere (I've reviewed my 50-some DM logs, as well as ones I've gotten from other members, and nowhere do I see the O2mV's bouncing as yours do).
I would...
1- Disconnec the 3-wire connector at the O2 sensor. Use a multimeter to test for any type of continuity to ground between the purple wire and chassis ground (pull and wiggle the wires around because this will be an intermittent problem).
2- If the above does not show any continuity, then replace the O2 sensor.
3- If this doesn't do it, swap another ECM... again....
Hope this helps....
Looking at the factory service manuals and at that last log Matt.
Looks like it's boiling down to a couple of issues....
But first a question.... which O2 sensor is wired into the ECM, the factory or the PLX?
It looks like the possibilities could be...
1 - Faulty ECM, or circuit 412 (purple wire at 3-wire O2 sensor connector) intermittent to ground.
2- Fuel pressure (I'm sure you said you checked this as it was stumbling at the different rpm's).
3 - Exhaust leak (pulling raw air into the exhaust can cause erratic O2 readings. Vacuum or crankcase leaks can cause a lean condition - PCV valves good and operating?).
If all above are OK, then it's the O2 sensor.... (this is quoting out of the service manual).
Your O2 mV values are way outside of the nominal range (as stated in the service manual).... plus they are just bouncing everywhere (I've reviewed my 50-some DM logs, as well as ones I've gotten from other members, and nowhere do I see the O2mV's bouncing as yours do).
I would...
1- Disconnec the 3-wire connector at the O2 sensor. Use a multimeter to test for any type of continuity to ground between the purple wire and chassis ground (pull and wiggle the wires around because this will be an intermittent problem).
2- If the above does not show any continuity, then replace the O2 sensor.
3- If this doesn't do it, swap another ECM... again....
Hope this helps....
BoostedSUV
Active member
Re: One last shot... Breaking up!
Rob if it was faulty O2 why would I still have the problem with the O2 disconnected. At that point the truck is in 'open loop' and the O2 sensor is not controlling fueling. I have the factory O2 wired to the ECM and the WBO2 is wired to the ECM for datalogging purposes only. I've never tried to check the purple wire for coninuity to ground but it making connection with 0 resistance to the ECM.
As far as checking the PCV system, I pulled out the valve that connects to the TB and it was sucking air, when I put my finger over it it snapped closed. I never checked the front PCV valve as it is connected to my homemade intake pipe and doesn't appear to do much.
This is the 4th ECM I've had in the truck and I'm certainly not going change that again...
Rob if it was faulty O2 why would I still have the problem with the O2 disconnected. At that point the truck is in 'open loop' and the O2 sensor is not controlling fueling. I have the factory O2 wired to the ECM and the WBO2 is wired to the ECM for datalogging purposes only. I've never tried to check the purple wire for coninuity to ground but it making connection with 0 resistance to the ECM.
As far as checking the PCV system, I pulled out the valve that connects to the TB and it was sucking air, when I put my finger over it it snapped closed. I never checked the front PCV valve as it is connected to my homemade intake pipe and doesn't appear to do much.
This is the 4th ECM I've had in the truck and I'm certainly not going change that again...
Quickstop [UK]
Combating adversyty.
Re: One last shot... Breaking up!
Get Bezerk on a flight over there.
Or Jeff Scott.
I want to know what this is. This saga reminds me of the thread with gjp and his syclone woes a year or two ago.
Have you read his thread?
idle misfire
Get Bezerk on a flight over there.
Or Jeff Scott.
I want to know what this is. This saga reminds me of the thread with gjp and his syclone woes a year or two ago.
Have you read his thread?
idle misfire
BoostedSUV
Active member
Re: One last shot... Breaking up!
Seems like another undiscovered issue! Lol
Get Bezerk on a flight over there.
Or Jeff Scott.
I want to know what this is. This saga reminds me of the thread with gjp and his syclone woes a year or two ago.
Have you read his thread?
idle misfire
Seems like another undiscovered issue! Lol
WyoSyclone
Active member
Re: One last shot... Breaking up!
Well, let's see.... if the O2 is disconnected and the problem persists, it could be that the purple wire is still shorting directly to ground, presenting the ECM with a false signal.
Did the bypass capacitors get installed on the wideband wiring between B9 and E14?
Well, let's see.... if the O2 is disconnected and the problem persists, it could be that the purple wire is still shorting directly to ground, presenting the ECM with a false signal.
Did the bypass capacitors get installed on the wideband wiring between B9 and E14?
