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bri4msn
Samba Member
Joined: September 09, 2014
Posts: 30
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 Posted: Thu Dec 24, 2020 6:26 pm Post subject: Injector pulse is too fast |
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Hi,
1986 Vanagon manual.
My mechanic recently changed the Coolant Temperature Sensor because of reduced power at low RPM.
The spark plugs also are very dark, running very rich on fuel.
Now the engine is no longer turning on and using a light bulb to measure the activity of the injectors, it indicates that the injectors are firing too fast.
We are planning to swap the ECU for another one that is known to be good, in order to see if this is the origin of the problem.
Are there any other factors that could be causing the injectors to be firing so fast?
Thank-you to all and Happy Holidays!
Barry |
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fxr
Samba Member
Joined: December 07, 2014
Posts: 2321
Location: Bay area CA
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| Posted: Thu Dec 24, 2020 6:41 pm Post subject: Re: Injector pulse is too fast |
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What do you mean by 'firing too fast'? Do you mean they fire too often, or that they stay on for too long in each cycle? How are you diagnosing this with a filament light bulb?
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Jim Crowther
1984 1.9l EJ22 Westy Wolfsburg Edition
Vespa GTS 300 |
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MarkWard
Samba Member
Joined: February 09, 2005
Posts: 17118
Location: Retired South Florida
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| Posted: Thu Dec 24, 2020 6:41 pm Post subject: Re: Injector pulse is too fast |
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You should be using an LED to test. A light bulb may draw too much load. Not good for the ECU.
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bri4msn
Samba Member
Joined: September 09, 2014
Posts: 30
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| Posted: Thu Dec 24, 2020 6:48 pm Post subject: Re: Injector pulse is too fast |
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Yes, sorry, it's an LED.
I'm trying to upload a video of the LED as I try to start her up. The LED is blinking very fast, and the engine is not turning on. |
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wcdennis
Samba Member
Joined: July 20, 2004
Posts: 955
Location: Winston-Salem NC
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| Posted: Thu Dec 24, 2020 7:45 pm Post subject: Re: Injector pulse is too fast |
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| Before you go too far down that rabbit hole, you should try spraying some starting fluid in the intake and see if you can get it to run for a second or two. That’s the easiest was to confirm a fuel delivery problem. It also verifies all the other conditions for running. |
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crazyvwvanman
Samba Member
Joined: January 28, 2008
Posts: 9923
Location: Orbiting San Diego
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| Posted: Thu Dec 24, 2020 7:48 pm Post subject: Re: Injector pulse is too fast |
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Each injector should pulse 2 times for every crank pulley revolution.
Each injector should pulse 4 times for every distributor revolution.
Mark
| bri4msn wrote: |
Yes, sorry, it's an LED.
I'm trying to upload a video of the LED as I try to start her up. The LED is blinking very fast, and the engine is not turning on. |
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bri4msn
Samba Member
Joined: September 09, 2014
Posts: 30
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| Posted: Thu Dec 24, 2020 7:55 pm Post subject: Re: Injector pulse is too fast |
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| Thank-you, I will relay this to my mechanic. |
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Wildthings
Samba Member
Joined: March 13, 2005
Posts: 50338
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| Posted: Fri Dec 25, 2020 12:10 am Post subject: Re: Injector pulse is too fast |
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If the problem started when the TSII sensor was changed, I would be going back over that work to see what was done wrong. There are two dimensionally similar sensor installed into the thermostat housing and its possible to switch the wires. Doesn't know what effect this might have though.
I would certainly check the resistance of the new sensor to see it it matches the book value. |
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djkeev
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Joined: September 30, 2007
Posts: 32591
Location: Reading Pennsylvania
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