1989 740 Code 144 sputtering/stalling when I go over bumps

AwesomeTreehouse · Post by **AwesomeTreehouse** » 27 Apr 2014, 10:19

So I've been having this issue lately that's really confusing me.

What happens is when I go over a really rough bump my car will almost stall. The RPMs drop, the Check Engine Light flashes on, and it feels like someone hit the brakes. It usually just sputters quickly. Only once has it fully stalled out.

I checked my OBD codes and I'm getting 144. Volvo says that is "No load signal from fuel injection system" which could be a result of "Bad fuel injection relay; faulty wiring from LH to EZK; bad LH module"

So my question is: 1) where the heck is the Fuel Injection Relay? 2) why would this happen when I go over bumps? What could that indicate? 3) Has anyone else had this issue?

lummert · Post by **lummert** » 27 Apr 2014, 12:08

Radio interference suppression relay is in the engine compartment. Fuel pump relay is in the fuse panel behind the ash tray.

shegarty · Post by **shegarty** » 09 May 2014, 07:41

First, try to stop running over bums

Next check the fuel pump relay as they are known to have faults. My previous 740 had similar issues and would sometimes just stall out on the highway at speed

. At the time I didn't have a replacement and would leave the cover off the relay/fuse access panel and just give 'er a little jiggle. Thankfully I soon found a replacement and cured the issue. While you are in there check the pins on the mounting plate to make sure that you have good contact with the relay pins. BTW if I remember correctly the fuel pump relay is the white one. Good luck.