Stalling on start-up

steventadams · 08-18-2008, 07:49 AM

Truck began stalling on start-up 2-3 starts after cleaning the MAF sensor and IAC to combat a high idle problem. Checked the coilpack and the secondary resistance is out of spec on all coils (13k ohms for coil 1+2, 14k ohms for coil 3). Couldn't check the primary because the connector faces the firewall and I couldn't see what I was doing. Is this considered too far out of spec or is that acceptable? Could that be contributing to my problem? Thanks.

aldive · 08-18-2008, 09:42 AM

Did you reset the PCM?

*dogfriend* · 08-18-2008, 10:29 AM

I don't think the coil pack would cause your stalling problem. When my coil pack was out of spec (12.5K ohms) it would show up as a misfire under load, like climbing a hill or pulling my trailer. It never set a code, but I could feel it misfire and it showed up on my scan tool as a misfire.

When I had a stalling problem, it was my IAC sticking. My problem was only with an already warm engine though.

steventadams · 08-18-2008, 10:48 AM

Quote:

Originally Posted by aldive

Did you reset the PCM?

I had the battery disconnected while I did it but reconnected it a minute or two after I put the MAF/IAC back together. It was disconnected for probably 15 minutes.

steventadams · 08-18-2008, 10:54 AM

Quote:

Originally Posted by dogfriend

I don't think the coil pack would cause your stalling problem. When my coil pack was out of spec (12.5K ohms) it would show up as a misfire under load, like climbing a hill or pulling my trailer. It never set a code, but I could feel it misfire and it showed up on my scan tool as a misfire.

When I had a stalling problem, it was my IAC sticking. My problem was only with an already warm engine though.

The CEL hasn't come on yet and I don't feel any misfires although in the last 2 weeks it has been running somewhat rough. My mpg has dropped 15% and it feels a little sluggish... I supposed I could borrow a data cable and try to grab something as I drive

*dogfriend* · 08-18-2008, 02:01 PM

Quote:

Originally Posted by steventadams

The CEL hasn't come on yet and I don't feel any misfires although in the last 2 weeks it has been running somewhat rough. My mpg has dropped 15% and it feels a little sluggish... I supposed I could borrow a data cable and try to grab something as I drive

My truck never set the CEL even though I could feel the misfire. There is a PID called Misfire True. I set my scan tool to read the PID Misfire True and then drove up a hill where I could feel the misfire. About 1/2 a second after feeling the misfire, the PID would change from False to True for about 1 sec then go back to False.

steventadams · 08-18-2008, 04:54 PM

Quote:

Originally Posted by dogfriend

My truck never set the CEL even though I could feel the misfire. There is a PID called Misfire True. I set my scan tool to read the PID Misfire True and then drove up a hill where I could feel the misfire. About 1/2 a second after feeling the misfire, the PID would change from False to True for about 1 sec then go back to False.

Well the problem seems to have fixed itself for now. I started her up after work and she ran fan. Idled at 500rpm with no sign of stalling. There may be an intermittent issue at work here but until it shows up again I'm just gonna forget about it

Thanks anyway.

4x4firefighter · 08-19-2008, 02:15 PM

i too have the same problem....its very speratic but it will stall when ya start it...when it does this i start it and hit the gas just a lil(2500rpm) and for a sec or two and she's good to go... it only does it every now and again tho so i ignor it.....intrested to find out what problem really is tho

08-18-2008, 07:49 AM	#1
steventadams Wannabe Elite Explorer New Jersey 2001 Sport Join Date: Feb 2007 Posts: 978 Vehicle Specs (Original Poster)	Stalling on start-up Truck began stalling on start-up 2-3 starts after cleaning the MAF sensor and IAC to combat a high idle problem. Checked the coilpack and the secondary resistance is out of spec on all coils (13k ohms for coil 1+2, 14k ohms for coil 3). Couldn't check the primary because the connector faces the firewall and I couldn't see what I was doing. Is this considered too far out of spec or is that acceptable? Could that be contributing to my problem? Thanks. __________________ -Steve 2001 Explorer Sport 4x4, Silver.

08-18-2008, 09:42 AM	#2
aldive Elite In Memoriam 1999 XLT Join Date: Jan 2001 Posts: 25,271 Vehicle Specs	Did you reset the PCM? __________________ Al Franklin My truck My Quest for 30 RIP Al Franklin! 1947-2010. Gone but not forgotten! :(

08-19-2008, 02:15 PM	#8
4x4firefighter Wannabe Elite Explorer Oneonta, NY 99 Eddie Limited Join Date: May 2008 Posts: 106 Vehicle Specs	i too have the same problem....its very speratic but it will stall when ya start it...when it does this i start it and hit the gas just a lil(2500rpm) and for a sec or two and she's good to go... it only does it every now and again tho so i ignor it.....intrested to find out what problem really is tho __________________ 4x4firefigher.....99 Eddie Limited.... TT/ WORRIOR shackles, BLAZER off road roof lightbar http://www.myspace.com/axn6254_4x4firefighter

08-18-2008, 10:29 AM	#3
dogfriend Human-Animal Hybrid Carmichael, CA '97 Sport 4x4 Join Date: Jul 2002 Posts: 8,828 Vehicle Specs	I don't think the coil pack would cause your stalling problem. When my coil pack was out of spec (12.5K ohms) it would show up as a misfire under load, like climbing a hill or pulling my trailer. It never set a code, but I could feel it misfire and it showed up on my scan tool as a misfire. When I had a stalling problem, it was my IAC sticking. My problem was only with an already warm engine though.