91 240 s/w no start
#1
91 240 s/w no start
I was coming home yesterday and the engine just shut off, didn't hear a sputter or missing out or anything. Will not restart. Did some checking today. I have spark at #1 plug wire. Could not hear fuel pump run after turning key to on. Disconnected fuel line and had no pressure. I jumped #4 & $6 fuses, pump runs and shoots fuel out. I then pulled the relay out and jumped 30 and 87/2, again pump ran and flowed fuel. I substituted 2 different identical relays and no fuel. Then I reconnected the fuel line, jumpered #4 & 6 on the fuse panel, could hear pump running, and tried to start, would not try, cranks good, no start. How can I have spark, force the pump to run and yet not even try to start? I can't afford to throw parts at it, any ideas? I'm guessing since I've got spark, the cps, computer and ignition circuit is good. To just shut off like it did, I expected it to be the cps, but I have spark.
Thanks
dave
Thanks
dave
#2
#3
#4
#5
Its possible that something is wrong with your fuel ECU, and the injectors aren't opening. I would check for both ignition and fuel trouble codes. See the LH2.4 section:
http://www.brickboard.com/FAQ/700-90...neOBDCodes.htm
The fuel relay also contains the "system" relay, make sure you have battery voltage on the orange #5 wire connected to the AMM, with the key on.
http://www.brickboard.com/FAQ/700-90...neOBDCodes.htm
The fuel relay also contains the "system" relay, make sure you have battery voltage on the orange #5 wire connected to the AMM, with the key on.
#6
I'm an idiot. Tested the stuff posted about today. Then realized I didn't have a fuel pump relay even plugged in. Here's the correct info:
Battery voltage 12.5, orange #5 wire at AMM voltage same.
Got a 1-1-1 out of the diagnostics.
Found 2 computer looking boxes under dash in passenger footwell. Wiggled connectors and pushed in solidly. No change.
dave
Battery voltage 12.5, orange #5 wire at AMM voltage same.
Got a 1-1-1 out of the diagnostics.
Found 2 computer looking boxes under dash in passenger footwell. Wiggled connectors and pushed in solidly. No change.
dave
Last edited by nepatternmaker; 11-10-2010 at 05:26 PM.
#7
#8
#9
There's a 3rd box in the outside of the passenger footwell behind the kick panel. It's number ends with -561. I don't have noid lights and I'm by myself again tonight so can't listen while cranking the motor. Probably too deaf to hear it, anyway. Can I check the injectors with a basic DVOM? Will my cheap Craftsman DVOM cyle fast enoug to work? It's not a graphing model, unfortunately.
dave
dave
#13
#15
#18
I grounded the blue/green wire at the fuel pump relay tonight. Started right up. I drove it to town that way (34 mile round trip) and it ran great all the way. I will look for a replacement for the fuel ECU. Will also look for corrosion behind the fuse panel, have not done that yet.
I appreciate all the help from everyone; Bubba240, you nailed it for me. I would never have got this running without your help.
Thank you
dave
I appreciate all the help from everyone; Bubba240, you nailed it for me. I would never have got this running without your help.
Thank you
dave
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