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Old 06-11-2021, 07:09 PM   #1
Nickagriffin
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Default 1992 240 No Spark, No start

Does anyone have the greenbook PDF for LH2.4 240s? I could only find up to LH2.2 and I'm trying to troubleshoot.

My new 240 cranks and primes the fuel pumps but no spark last time I checked. The weird this is, after I crank for a while it will pop and stumble a bit like it only gets spark AFTER I am done cranking.

I originally thought this meant the CPS was reading wrong, but I replaced it with no luck. I also tried two good known ECUs and EZKs with no luck. Havent tried dizzy rotor/cap or spark plugs yet but it was running a few days ago with all the same junk that I have on it now.

Also the first time this happened, I let it sit for a while and it miraculously started working again before breaking for good the next day.


EDIT: I have spark now but still no start
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Old 06-11-2021, 07:13 PM   #2
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https://ozvolvo.org/archive/

Search for 2.4
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Old 06-11-2021, 07:29 PM   #3
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Thanks!

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Old 06-11-2021, 08:55 PM   #4
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Clip a meter or a test light to the blue coil power wire and a nearby ground. Check that you have +12volts when you turn the key on AND while cranking. If the ignition switch is flakey, it might drop EZK/Ignition power when cranking.
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Old 06-11-2021, 09:03 PM   #5
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^^ That!

I had an ignition switch that would occasionally not prime the fuel pump and would also result in no start cranking. I ignored it until one time i was in a Home Depot parking lot, looking like an idiot for about 10 minutes. Took the switch apart and cleaned all the contacts and I haven't had a problem since.
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Old 06-12-2021, 12:08 PM   #6
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Ignition switch seems fine, 13v when not cranking with jumper cables hooked up, drops down to 9.5V and then back up to 10V when cranking. Checked my (working) wagon to see what it did when cranking, went from 11.5V down to about 9V. So everything seems normal right?

I guess I'll try the normal tune up stuff next but I doubt that's the problem.
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Old 06-12-2021, 12:27 PM   #7
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Injector pulse?
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Old 06-12-2021, 12:29 PM   #8
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I had a weird issue like this- sometimes no start, sometimes fine. All signs pointed to loss of spark.
It happened to me while I was filling up with gas. I looked at the ignition switch and found a relay interposed in the switch wiring to the coil. It was the remnants of an old alarm system installed by the PO. Jumped it- fixed.
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Old 06-12-2021, 02:18 PM   #9
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Quote:
Originally Posted by ZVOLV View Post
Injector pulse?
So I tested pulse with a test light, seemed to blink in sync with the engine rpm. Probed the red/black wire.

Also, I guess I made a mistake somewhere along the way, I actually do have spark while cranking. Must be timing or fuel then I guess. Feels like timing but still not sure.
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Old 06-12-2021, 02:53 PM   #10
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Check that the bull**** fuse next to the battery isn’t broken. It’s the fuse for the ecu and will cause a no start if it’s broken.
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Old 06-12-2021, 03:05 PM   #11
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Quote:
Originally Posted by Marvelous3 View Post
Check that the bull**** fuse next to the battery isnít broken. Itís the fuse for the ecu and will cause a no start if itís broken.
Wasn't that replaced in 1991 with fuse #6 in the cabin? If so, I checked #6 inside and it looks good.
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Old 06-12-2021, 03:07 PM   #12
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Quote:
Originally Posted by Nickagriffin View Post
Ignition switch seems fine, 13v when not cranking with jumper cables hooked up, drops down to 9.5V and then back up to 10V when cranking. Checked my (working) wagon to see what it did when cranking, went from 11.5V down to about 9V. So everything seems normal right?

I guess I'll try the normal tune up stuff next but I doubt that's the problem.
Where are you taking those readings?
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Old 06-12-2021, 03:08 PM   #13
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Quote:
Originally Posted by 2manyturbos View Post
Where are you taking those readings?
Negative side of multimeter on negative battery terminal, positive side probing blue wire side of coil
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Old 06-12-2021, 04:00 PM   #14
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Quote:
Originally Posted by Nickagriffin View Post
Wasn't that replaced in 1991 with fuse #6 in the cabin? If so, I checked #6 inside and it looks good.
Could be? My 91 has/had it in the engine bay.
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Old 06-12-2021, 04:08 PM   #15
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Quote:
Originally Posted by Marvelous3 View Post
Could be? My 91 has/had it in the engine bay.
Well I didn't see it in the same spot that my 1988 has it. Maybe they moved it?

Doesn't this fuse control the fuel system though? Would the pumps still prime if it was bad?
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Old 06-12-2021, 04:40 PM   #16
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Also just checked timing, at TDC cam is lined up with top notch and dizzy is lined up with cylinder number 1. Dizzy order is 1-3-4-2
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Old 06-12-2021, 07:44 PM   #17
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A 1992 does not have a fuse in the engine bay.

Have you checked the fuel pressure?
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Old 06-12-2021, 09:03 PM   #18
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Quote:
Originally Posted by 2manyturbos View Post
A 1992 does not have a fuse in the engine bay.

Have you checked the fuel pressure?
Good to know.

On these no start things I used to always start with spraying starter fluid into the intake to eliminate fuel as the issue.
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Old 06-12-2021, 11:21 PM   #19
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Quote:
Originally Posted by Marvelous3 View Post
Good to know.

On these no start things I used to always start with spraying starter fluid into the intake to eliminate fuel as the issue.
I did that test when this problem first started happening with no luck but for whatever reason when I tried it today it fired right up. Each time I went to start it after that it ran fine until I waited for a while and then it wouldn't start again.

Now I'm leaning towards in-tank pump since I couldn't hear it running and I have less than half a tank.

Maybe it was a combination of in tank pump and CPS? Who knows
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Old 06-12-2021, 11:27 PM   #20
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From memory, you jumper fuse 4 and 6, bypassing the fuel pump relay, so the pumps turn on with key power on. You can then go back to the trunk, pull the carpet back and see if you can hear the pump running.
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Old 06-13-2021, 01:23 PM   #21
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Does it run on starting fluid? Click my sig
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Old 06-23-2021, 02:39 AM   #22
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Quote:
Originally Posted by Marvelous3 View Post
From memory, you jumper fuse 4 and 6, bypassing the fuel pump relay, so the pumps turn on with key power on. You can then go back to the trunk, pull the carpet back and see if you can hear the pump running.

http://cleanflametrap.com/transferPump.htm

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