Intermittent Start

Old 11-19-2016, 10:30 PM
Junior Member
Thread Starter
Join Date: Nov 2016
Posts: 12
Default Intermittent Start

I bought this car two weeks ago and now the thing isn't starting at all. I've worked through the fuel system and it's getting gas, It's getting air, but there's still a no start condition. The OBD2 port loses communication with my tool intermittently and won't display I/M monitors.
Checked the continuity of all the sensors with a circuit tester and a multi meter, everything checks out just fine. This problem is somewhat mystifying to me. Any help is appreciated.

Last edited by R32fanboy; 12-20-2016 at 02:44 PM.
Old 11-21-2016, 11:49 PM
Join Date: Aug 2015
Posts: 36

fuel pump relay
Old 12-20-2016, 02:48 PM
Junior Member
Thread Starter
Join Date: Nov 2016
Posts: 12

So I took the car to a local Volvo expert, and he took one look at the car and said "ECU." He promptly pulled the box to the ECU apart, cleaned and resurfaced the connections and sprayed conductivity chemical on the connections before boxing it all back up and making sure there was a hose connecting the ECU box to the radiator shroud.
Now it starts and runs fine.
I have never seen anything like this before.
Old 01-05-2017, 03:40 PM
Join Date: Mar 2012
Location: Ridgefield, CT
Posts: 4,670

The OBD2 will show diagnostic codes for communications errors - but not all tools read all codes. My bet is he used a better scanner and saw the error code.
Old 02-06-2017, 12:12 PM
Junior Member
Thread Starter
Join Date: Nov 2016
Posts: 12

Update time:
Well, months later and it still starts and runs fine.
*Knock on wood*
Hopefully this is the last I see of this particular problem. In the future (probably a year or so down the road) I'll be looking into an upgraded ECU. The power gain opportunity is just too tempting.
Related Topics
Thread Starter
Last Post
Volvo 240, 740 & 940
03-09-2012 09:54 AM
Volvo 240, 740 & 940
03-23-2009 11:24 PM
Volvo S60 & V60
10-21-2006 04:14 PM
All Other Volvo's
06-22-2004 01:48 AM

Thread Tools
Search this Thread
Quick Reply: Intermittent Start

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.