 D-jet problems |
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| PCH |
 Feb 10 2020, 12:43 PM
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#1
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Member  Group: Members Posts: 144 Joined: 3-January 19 From: Santa Barbara Member No.: 22,772 Region Association: Southern California 
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Does anyone make D-jet wiring harnesses?
I am also wondering if my ECU is giving me problems. I just can't develop any power above about 3,500 rpm under load (such as going up a hill). I have replaced the throttle body (which improving things for a day), rebuilt the MPS (minor improvement). Valves checked, points and timing checked. Fuel filter replaced. Fuel pressure checked. Throttle body rechecked and readjusted. The engine is a 1911 in a 1971 1.7l and ran fine after the rebuilt (had to be careful not to overrev it in the break in period). Now I can't get it to go above 4,000 rpm underload. It seems like the last 2 suspects would be the wiring harness and ECU. Does anyone have a working ECU that I could "borrow" to see if my ECU is bad. Or does someone have a tester that could be rented to test the unit. Any suggestions? Thank you. |
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| 914werke |
Feb 10 2020, 12:46 PM
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#2
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"I got blisters on me fingers" Group: Members Posts: 11,030 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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Probably not the ECU. Id start with Fuel & ignition ...need some more details of your build
A member vendor here contact Jeff LINK for a quality reproduction wire harness (IMG:style_emoticons/default/bye1.gif) |
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| dlee6204 |
Feb 10 2020, 01:25 PM
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#3
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Howdy Group: Members Posts: 2,162 Joined: 30-April 06 From: Burnsville, NC Member No.: 5,956 |
Have you inspected your harness for any damage? Checked your grounds on the engine case? Checked to make sure all connections are still fully seated?
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| Bleyseng |
Feb 10 2020, 02:01 PM
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#4
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
I'd check the dizzy for sticking advance weights and timing.
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| PCH |
Feb 11 2020, 05:14 PM
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#5
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Member Group: Members Posts: 144 Joined: 3-January 19 From: Santa Barbara Member No.: 22,772 Region Association: Southern California
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Thank you all for your help!
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| Morrie |
Feb 11 2020, 10:49 PM
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#6
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Member Group: Members Posts: 181 Joined: 8-October 07 From: Cedar Park, Texas Member No.: 8,198 Region Association: Southwest Region
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Make sure your injectors are firing on all 4 cylinders too. The points in the base of the distributor. Pull plug wires one at a time while running and make sure you notice a difference on each hole when no spark is provided.
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| 913B |
Feb 12 2020, 01:03 AM
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#7
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Senior Member Group: Members Posts: 854 Joined: 25-April 05 From: South Bay/SoCal Member No.: 3,983 Region Association: None |
Jeff Bowlsby and Mikey914 both make harnesses.
You said you checked the fuel PSI, what kind of pressures were you getting. Has the fuel tank ever been cleaned or the original? The reason is my friend's car had same thing and the filter screen at the bottom of the tank was clogged from rust and sediments. |
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| dr914@autoatlanta.com |
Feb 12 2020, 10:03 AM
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#8
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914 Guru Group: Members Posts: 8,110 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
are you sure that the car is running on all four, the dwell and timing is correct, and the compression is good and the valves are in adjustment? That is where you should start
QUOTE(PCH @ Feb 10 2020, 11:43 AM)  Does anyone make D-jet wiring harnesses? I am also wondering if my ECU is giving me problems. I just can't develop any power above about 3,500 rpm under load (such as going up a hill). I have replaced the throttle body (which improving things for a day), rebuilt the MPS (minor improvement). Valves checked, points and timing checked. Fuel filter replaced. Fuel pressure checked. Throttle body rechecked and readjusted. The engine is a 1911 in a 1971 1.7l and ran fine after the rebuilt (had to be careful not to overrev it in the break in period). Now I can't get it to go above 4,000 rpm underload. It seems like the last 2 suspects would be the wiring harness and ECU. Does anyone have a working ECU that I could "borrow" to see if my ECU is bad. Or does someone have a tester that could be rented to test the unit. Any suggestions? Thank you. |
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