| Author |
Message |
slugoz
Samba Member
Joined: July 24, 2023
Posts: 4
|
 Posted: Tue Jul 25, 2023 12:31 pm Post subject: Re: Fuel Injection Resources |
 |
|
| Thank you Busdaddy, ill start looking in those directions. |
|
| Back to top |
|
 |
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53097
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Mon Jul 24, 2023 3:10 pm Post subject: Re: Fuel Injection Resources |
|
|
Welcome!
| slugoz wrote: |
| I have a '77 Super Conv. with Bosch L-Jetronic FI. It is a summer driver only, and on the warmer days after the engine warms up the idle will lower until it barely can idle, but it doesn't do it on the cooler days. Any thoughts on what that could be a symptom of? |
When something runs worse when warm it's usually too rich, in rare cases it's a vacuum leak that opens up with heat....
The first thing to look into is the TS2 on top of the #4 head, dirty threads or a faulty sensor can cause rich running: https://ratwell.com/technical/TempSensorII.html
The idle mixture screw o the AFM may have been messed with to compensate for previous vacuum leaks you may (or may not have) fixed later, if the TS2 checks out OK try turning the AFM bypass screw CCW and see if the idle improves, count turns so you can put it back if not. This adjustment is best made while connected to an exhaust analizer to set the Co level, but if it improves the idle it tells you you are on to something.
There's also a small chance the AAV is binding or lazy and doesn't fully close unless it's much warmer than average operating temperature.
All this assumes your engine has recently had a full tune up including a valve adjustment and timing set by the full mechanical advance method, it also assumes you have a funtional cooling flap thermostat and all the engine surround tins and seals are in place and functional.
_________________
Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
|
| Back to top |
|
|
slugoz
Samba Member
Joined: July 24, 2023
Posts: 4
|
| Posted: Mon Jul 24, 2023 2:38 pm Post subject: Re: Fuel Injection Resources |
|
|
| I have a '77 Super Conv. with Bosch L-Jetronic FI. It is a summer driver only, and on the warmer days after the engine warms up the idle will lower until it barely can idle, but it doesn't do it on the cooler days. Any thoughts on what that could be a symptom of? |
|
| Back to top |
|
|
VW_Jimbo 
Samba Member
Joined: May 22, 2016
Posts: 11391
Location: Huntington Beach, CA
|
| Posted: Sun Aug 09, 2020 9:41 pm Post subject: Re: Fuel Injection Resources |
|
|
| busdaddy wrote: |
| Is it white (or used to be) and numbered #1? It won't run without it, if it's a single wire in it's own harness it's likely the #1 wire, the only other single wire is the TS2 on top of cylinder #4 and it's much longer. |
And that wire attaches to the #1 side of the coil, same as the condenser. That is the rpm signal, used in firing the injectors. Without it and nothing happens!
_________________
Jimbo
There is never enough time to do it right the first time, but all the time necessary the second time!
| TDCTDI wrote: |
| Basically, a whole bunch of fuckery to achieve a look. |
| 67rustavenger wrote: |
GFY's Xevin and VW_Jimbo!  |
|
|
| Back to top |
|
|
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53097
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Sun Aug 09, 2020 5:31 pm Post subject: Re: Fuel Injection Resources |
|
|
Is it white (or used to be) and numbered #1? It won't run without it, if it's a single wire in it's own harness it's likely the #1 wire, the only other single wire is the TS2 on top of cylinder #4 and it's much longer.
_________________
Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
|
| Back to top |
|
|
bernie5791
Samba Member
Joined: January 19, 2016
Posts: 8
Location: BROOKLINE N.H
|
| Posted: Sun Aug 09, 2020 2:49 pm Post subject: Re: Fuel Injection Resources |
|
|
I just reinstalled the engine in my 1975 vert. I have one wire that I did not label. I think it is the wire that sends a signal to the controller for the F.I. unit. I believe it goes to the minus side of the coil. Just checking before I start it up.
Any answers out there.
Bernie 5791 |
|
| Back to top |
|
|
67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 11414
Location: Oregon
|
| Posted: Sun Jul 05, 2020 10:35 am Post subject: Re: Fuel Injection Resources |
|
|
| bernie5791 wrote: |
| I have put a new coil in the car. Somewhere along the line someone told me an old coil could cause problems similar to my issue. I have yet to take it out for a test. Trouble is that it only stops running when out on the road. It can idle till the cats come home and never stop. I have a tow package with my insurance so I can get the thing back home. I just hate the ride of shame. |
Thing happen.
Mines been on the roll back at least three times.
1. Broken shift rod bushing carrier.
2. Broken rag joint.
3. Worn out oil pump drive tang (no oil pressure).
All were easy to fix at home. The break downs took place within 11 miles or less from the house.
There's no shame in getting your car home and in one piece.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!
2003 Astrovan? GFYS again, Xevin! 
Don't let your bad ideas remain, ideas! |
|
| Back to top |
|
|
bernie5791
Samba Member
Joined: January 19, 2016
Posts: 8
Location: BROOKLINE N.H
|
| Posted: Sun Jul 05, 2020 9:27 am Post subject: Re: Fuel Injection Resources |
|
|
| I have put a new coil in the car. Somewhere along the line someone told me an old coil could cause problems similar to my issue. I have yet to take it out for a test. Trouble is that it only stops running when out on the road. It can idle till the cats come home and never stop. I have a tow package with my insurance so I can get the thing back home. I just hate the ride of shame. |
|
| Back to top |
|
|
garyt
Samba Member
Joined: June 14, 2015
Posts: 763
Location: Burgundy
|
| Posted: Fri Dec 09, 2016 1:54 am Post subject: Re: Fuel Injection Resources |
|
|
Or maybe the fuel pump relay in the double relay was sticking.
You can easily test the pump is ok by taking off the wire from the relay to the fuel pump and touching it briefly to the battery + post. The pump will run if good., and if it does the problem is probably the relay (pump and.or power relay). |
|
| Back to top |
|
|
busdaddy
Samba Member
Joined: February 12, 2004
Posts: 53097
Location: Surrey B.C. Canada, but thinking of Ukraine
|
| Posted: Thu Dec 08, 2016 11:09 pm Post subject: Re: Fuel Injection Resources |
|
|
Not sure why playing with the key would improve things, L-jet doesn't pre run the pump like modern systems, only when actually cranking or when it's running. I suspect you have ignition switch issues (worn out) and fiddling with the key restores contact.
_________________
Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
|
| Back to top |
|
|
Hilbilyrocker
Samba Member
Joined: November 19, 2016
Posts: 34
Location: Colfax, Ca
|
| Posted: Thu Dec 08, 2016 10:33 pm Post subject: Re: Fuel Injection Resources |
|
|
After passing smog. I realized I was having a problem with my fuel pump.
After clicking the key on and off a couple times, the car now starts every time.
Must not be holdin pressure, either in the pump itself or somewhere else.
Things have kinda settled because the car is outside and has been rainy and cold. |
|
| Back to top |
|
|
Hilbilyrocker
Samba Member
Joined: November 19, 2016
Posts: 34
Location: Colfax, Ca
|
| Posted: Wed Nov 23, 2016 7:40 pm Post subject: Re: Fuel Injection Resources |
|
|
While having the car smogged. The mechanic made a suggestion to turn the key ignition on and off 5-6 time.
I don't know why but the car started right up.
This is my third bug. I know they have their own personalities, but really?
Happy Thanksgiving! |
|
| Back to top |
|
|
KKiley
Samba Member
Joined: March 08, 2016
Posts: 665
Location: Aruba, Jamica, nope, Kokomo
|
| Posted: Tue Nov 22, 2016 9:05 am Post subject: Re: Fuel Injection Resources |
|
|
| Hilbilyrocker wrote: |
| I jumped a big hurdle today passing California smog. Now if I can just get the car to start normally. I will work on your suggestions and let you know how thing progress. Thank you |
Congrats on passing smog. That is next on my list. It's hard finding a shop that will attempt it. They find out the age and it has a clutch and they decline to even try.
_________________
1978 Super Beetle convertible
Click to view image |
|
| Back to top |
|
|
68IHscout
Samba Member
Joined: March 10, 2010
Posts: 3122
Location: santa ana ca
|
| Posted: Tue Nov 22, 2016 7:07 am Post subject: Re: Fuel Injection Resources |
|
|
| Hilbilyrocker wrote: |
| I jumped a big hurdle today passing California smog. Now if I can just get the car to start normally. I will work on your suggestions and let you know how thing progress. Thank you |
I yet to even try to pass smog , congrats ,yeah keep us updated . |
|
| Back to top |
|
|
Hilbilyrocker
Samba Member
Joined: November 19, 2016
Posts: 34
Location: Colfax, Ca
|
| Posted: Mon Nov 21, 2016 8:12 pm Post subject: Re: Fuel Injection Resources |
|
|
| I jumped a big hurdle today passing California smog. Now if I can just get the car to start normally. I will work on your suggestions and let you know how thing progress. Thank you |
|
| Back to top |
|
|
Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
|
| Posted: Mon Nov 21, 2016 1:36 pm Post subject: Re: Fuel Injection Resources |
|
|
This photo is from a bus...Terminal 50 on the starter.....One red/black wire goes to the ignition switch and the other red/white wire goes to the double relay to power the pump for fuel injected engines.
|
|
| Back to top |
|
|
68IHscout
Samba Member
Joined: March 10, 2010
Posts: 3122
Location: santa ana ca
|
| Posted: Mon Nov 21, 2016 1:07 pm Post subject: Re: Fuel Injection Resources |
|
|
| Randy in Maine wrote: |
| I like a bad connection at the starter to the double relay. |
I did not know that ,keep the info coming. |
|
| Back to top |
|
|
Randy in Maine
Samba Member
Joined: August 03, 2003
Posts: 34890
Location: The Beach
|
| Posted: Mon Nov 21, 2016 11:27 am Post subject: Re: Fuel Injection Resources |
|
|
| I like a bad connection at the starter to the double relay. |
|
| Back to top |
|
|
Hilbilyrocker
Samba Member
Joined: November 19, 2016
Posts: 34
Location: Colfax, Ca
|
| Posted: Mon Nov 21, 2016 10:34 am Post subject: Re: Fuel Injection Resources |
|
|
| Will do. Thank you for your input. |
|
| Back to top |
|
|
68IHscout
Samba Member
Joined: March 10, 2010
Posts: 3122
Location: santa ana ca
|
| Posted: Mon Nov 21, 2016 7:01 am Post subject: Re: Fuel Injection Resources |
|
|
| There must be a wire somewhere down the line that is not making contact ,hard to trace but can be done with patience ,checked you're fuses, one of my lights wasn't working all fuses looked good but one was crooked ,that is all it took for my light to fail ... |
|
| Back to top |
|
|
|
