Fuel Injector Going Bad?, FIXED - Thanks 914 World! Options

[saigon71]

When you tested your fuel pressure and you said it was spot on, does that mean the needle in the gauge stayed pretty steady? When I checked mine last week, it was high, so we set it at 31 as other 2056 guys said that was where they set theirs, but the needle jumped around a bit, kinda bouncing between 33 and 29, not steady at all, so if that's not the normal behaviour what do you think is happening with mine, trigger points maybe??

Ian Stott
Moncton
Canada

I just checked my fuel pressure today and adjusted it back toward 29 psi. That's kind of my experience - it bounces around a fair amount (anywhere from 1 to 3 psi of variance). Not sure if it's a cheap gauge, but I just kind of try to find the 'average' of the bouncing around.

I think the bouncing is normal. I got it real close to 30 with the car running. Immediately after shutting it off, I checked pressure and it showed 30PSI with no bouncing.

[saigon71]

I'll ship you the ecu and harness from my '73 if you think it will help troubleshoot.

Appreciate the offer Mark. I'm going to order a new Blowsby harness and see where it gets me first. I'm pretty sure it's a problem in the harness at this point.

[914Mels]

Another possible problem would be the trigger points in the distributor. You'll drop two cylinders when these act up. Also if your smelling gas, your ecu drivers may be holding the injectors open making it miss by being way too rich. The ecu on ours went bad and would intermittently miss due to fouled spark plugs. If you can duplicate the condition, shut the motor off and check to see if any of your plugs are fuel soaked.

[saigon71]

Well, the problem is fixed!

I filled up the tank last night and checked my gas mileage - 22 MPG. I normally get about 28. The car was running rich at all times...idle would drop to about 250 RPM.

Before popping on a new Blowsby FI harness, I wanted to rule everything else out first. Jim gave me a loaner ECU so I swapped it out today - no difference.

I went back to the good old d-jet bible in the troubleshooting section under "my car runs rich and I don't know why" for a comprehensive list of things to check.

http://members.rennlist.com/pbanders/DJetParts.htm

Ran through the list one by one - nothing helped. Then I got to the trigger points. Several world members indicated that they may be the problem. I had previously assumed these were not the problem because I cleaned and inspected them over the winter when I cleaned & lubed the disty.

Well, some grease from the lube job had collected on the trigger points. I swapped them out with another clean set, started the car and reset the timing/dwell. She is running as good as ever again! I think my old trigger points will be fine with a good cleaning - I'll test the theory next time I have the dizzy out.

I've spent a few very frustrating weeks on this...lesson learned - don't rule anything out because you "just serviced it." (IMG:style_emoticons/default/headbang.gif)

Thanks for all of the advice on this topic - much appreciated. (IMG:style_emoticons/default/beerchug.gif)

(IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif)

[DRPHIL914]

Well, the problem is fixed!

I filled up the tank last night and checked my gas mileage - 22 MPG. I normally get about 28. The car was running rich at all times...idle would drop to about 250 RPM.

Before popping on a new Blowsby FI harness, I wanted to rule everything else out first. Jim gave me a loaner ECU so I swapped it out today - no difference.

I went back to the good old d-jet bible in the troubleshooting section under "my car runs rich and I don't know why" for a comprehensive list of things to check.

http://members.rennlist.com/pbanders/DJetParts.htm

Ran through the list one by one - nothing helped. Then I got to the trigger points. Several world members indicated that they may be the problem. I had previously assumed these were not the problem because I cleaned and inspected them over the winter when I cleaned & lubed the disty.

Well, some grease from the lube job had collected on the trigger points. I swapped them out with another clean set, started the car and reset the timing/dwell. She is running as good as ever again! I think my old trigger points will be fine with a good cleaning - I'll test the theory next time I have the dizzy out.

I've spent a few very frustrating weeks on this...lesson learned - don't rule anything out because you "just serviced it."

Thanks for all of the advice on this topic - much appreciated. (IMG:style_emoticons/default/beerchug.gif)

(IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif) (IMG:style_emoticons/default/driving.gif)

Awesome! Congratulations!
Glad it was that simple, many times it's the simple one that's hard to find, or we dismiss it and don't go back and recheck it ! I spent 3 months trying to figure out a similar issue and ended up just putting in new cap and rotor, that was the issue!
Now drive it lime you stole it!

[JeffBowlsby]

Great News Bob! Glad it worked out for you and I bet you understand D-Jet a whole lot better by now.


Jeff BOWLSBY