- Local time
- 3:47 PM
- Joined
- Jul 17, 2008
- Messages
- 24,699
- Reaction score
- 74,385
- Location
- South Jersey USA
I have a holley 770 and a points dizzy you can use 
HawkRod Tour 2025 - (North East Region of USA)
- Thread starter HawkRod
- Start date
- Local time
- 12:47 PM
- Joined
- Jan 16, 2011
- Messages
- 76,397
- Reaction score
- 120,463
- Location
- NorCal Sierras
I'll be watching for the videos & photos, wish I could go
sounds like a fun time & a bunch of great people/FBBO members
sounds like a fun time & a bunch of great people/FBBO members
I honestly just don't know yet. I haven't been able to diagnose the issue, so I don't really know what to fix.
Trust me, that thought crossed my mind, but converting back to a non-FI system is not straight forward. The fuel system pumps at 43 PSI, the locked distributor and ignition system all are different, and carefully integrated into my wiring harness. My car might look like RoadKill fodder if I try to switch...I have a holley 770 and a points dizzy you can use
road robert
Well-Known Member
YES I plan to join! I better get my arse in gear too, unfortunately working full time has been getting in the way... lol
Besides getting the new third member installed I am planning on:
1. Flush/drain coolant then new upper/lower hoses, thermostat housing and thermostat (180 degree)
2. Replace valve cover gaskets
3. Tune-up: points, condenser, rotor, cap & spark plugs
4. Oil/filter change - greas job
5. Rotate tires
6. Check exhaust manifold nuts and bolts for small leak
7. ...
Besides getting the new third member installed I am planning on:
1. Flush/drain coolant then new upper/lower hoses, thermostat housing and thermostat (180 degree)
2. Replace valve cover gaskets
3. Tune-up: points, condenser, rotor, cap & spark plugs
4. Oil/filter change - greas job
5. Rotate tires
6. Check exhaust manifold nuts and bolts for small leak
7. ...
Well, then both of us are knee deep in working on our cars to get them ready!
- Local time
- 3:47 PM
- Joined
- Jul 17, 2008
- Messages
- 24,699
- Reaction score
- 74,385
- Location
- South Jersey USA
I also have the gas tank you gave me, an external pump, and a roll of 12 ga wire...... but I digress
- Local time
- 3:47 PM
- Joined
- Jul 17, 2008
- Messages
- 24,699
- Reaction score
- 74,385
- Location
- South Jersey USA
looking less likely for me, sorry
I understand. Sometimes things don't come together as fast we hope.
Speaking of which: As update on my car.
When I built the car, I had a fuel pressure issue where I was not getting enough fuel pressure. Long story short, it turned out the tank was built with the wrong clamps so it was leaking inside the tank. Anyway, one of the early tests I performed was to verify that the fuel filter wasn't causing a restriction. It wasn't. But by the time I found the problem and got it resolved, I forgot to put the fuel filter back in! I know, I know: STUPID.
Bottom line is I have driven the car for 10 years with nothing other than than the sock in the tank for a filter. Good guy alert to @Don Frelier who basically advised me that with my stupidity I should just bite the bullet and buy new fuel injectors. So I will pay the piper and spend the $$$ to buy 8 new ones.
Hopefully I can source them quickly enough, get them in, and that they are indeed the issue.Fingers crossed!
- Local time
- 3:47 PM
- Joined
- Jul 17, 2008
- Messages
- 24,699
- Reaction score
- 74,385
- Location
- South Jersey USA
hopefully, that solves your problem......more often than not, it's something stupid and/or simple
In this case, it is stupid. Me! Even if this does not turn out to be the issue, not running a fuel filter with fuel injection is a really bad idea. Not sure how I missed putting the filter back in, but it is what it is....
- Local time
- 3:47 PM
- Joined
- Aug 9, 2020
- Messages
- 3,108
- Reaction score
- 10,644
- Location
- State College, Pennsylvania
Shortly after I had the first overhaul done on the C15 Cat in my Peterbilt, an oil sample showed fuel in the oil. The shop did a pressure test, and replaced five defective injectors under warranty. I paid for the sixth out of pocket to play it safe while the truck was down. Nearly $700 installed. I was careful about filter changes before that event, but I became paranoid afterwards.
- Local time
- 3:47 PM
- Joined
- Jul 17, 2008
- Messages
- 24,699
- Reaction score
- 74,385
- Location
- South Jersey USA
we wont break your balls until its fixed
Update: I have the injectors on order - they should arrive on May 23rd.
So @Don Frelier promised me that this was the issue, so if not, I get to borrow one of his cars!!!
So @Don Frelier promised me that this was the issue, so if not, I get to borrow one of his cars!!!
Last edited:
Well mine both run perfectly.Update: I have the injectors on order - they should arrive on May 23rd.
So @Don Frelier promised me that this was the issues, so if not, I get to borrow one of his cars!!!
View attachment 1853508
But you haven't seen my standard rental agreement yet
OK, an update on the Road Runner:
I got the new injectors and installed them. Man, what a pain in the butt to get the covers/ fuel supply connected and on. The O rings are always pretty fat, so it is hard to work them into the hole, and you can't just force them or you can cut them. On this, you have to get four o rings from injectors to seat at the same time - without being able to see or reach them!
Anyway, I got them on.
Fuel line has a new 10 micron filter installed, and it has been flushed thoroughly. Started the car. It ran a little better at first since the car was cold and the "choke" was on. But I noticed that the actual A/F mixture is pretty much stuck on 14.6. The idle A/F mixture is requesting 13.5, so the computer is trying to richen up the mixture. But since the actual A/F mixture is seemingly stuck at 14.6, it goes super rich and doesn't run well.
One other bit of information. The original F.A.S.T. O2 sensor went bad shortly before this all happened. I replaced the O2 sensor with a non F.A.S.T. branded O2 sensor that looked to be the same. (I actually have two that I have gotten over the years, although they are slightly different from one another.) Both these non F.A.S.T. O2 sensors operate the same way - actual A/F stuck at 14.6.
So are both my O2 sensors bad/ wrong application? Is there something in the computer that is bad (seems doubtful, everything else seems to be working properly)? Wiring?
At the moment I'm going to see how quickly I can get a F.A.S.T. branded O2 sensor here. But I'm willing to listen to all thoughts on this...
Any ideas @Nxcoupe ?
Hawk
I got the new injectors and installed them. Man, what a pain in the butt to get the covers/ fuel supply connected and on. The O rings are always pretty fat, so it is hard to work them into the hole, and you can't just force them or you can cut them. On this, you have to get four o rings from injectors to seat at the same time - without being able to see or reach them!
Anyway, I got them on.Fuel line has a new 10 micron filter installed, and it has been flushed thoroughly. Started the car. It ran a little better at first since the car was cold and the "choke" was on. But I noticed that the actual A/F mixture is pretty much stuck on 14.6. The idle A/F mixture is requesting 13.5, so the computer is trying to richen up the mixture. But since the actual A/F mixture is seemingly stuck at 14.6, it goes super rich and doesn't run well.
One other bit of information. The original F.A.S.T. O2 sensor went bad shortly before this all happened. I replaced the O2 sensor with a non F.A.S.T. branded O2 sensor that looked to be the same. (I actually have two that I have gotten over the years, although they are slightly different from one another.) Both these non F.A.S.T. O2 sensors operate the same way - actual A/F stuck at 14.6.
So are both my O2 sensors bad/ wrong application? Is there something in the computer that is bad (seems doubtful, everything else seems to be working properly)? Wiring?
At the moment I'm going to see how quickly I can get a F.A.S.T. branded O2 sensor here. But I'm willing to listen to all thoughts on this...
Any ideas @Nxcoupe ?
Hawk
Afr reading doesn't change at all?
On the MSD it reads 35 when you power up and don't have the engine running.
Did you try raising the setpoint to like 15 or higher and watch the duty cycle on the injectors?
On the MSD it reads 35 when you power up and don't have the engine running.
Did you try raising the setpoint to like 15 or higher and watch the duty cycle on the injectors?
- Local time
- 12:47 PM
- Joined
- Jan 16, 2011
- Messages
- 76,397
- Reaction score
- 120,463
- Location
- NorCal Sierras
@HawkRod
Could there be a difference
in O2 censors, between Closed & Open loop systems ?
just spit-balling, or does a O2 sensor in the F.A.S.T. EFI not care
location of the censors, not on the bottom of the pipe
needs to be up the side or on top, so excessive moisture doesn't kill it
good luck
Could there be a difference
in O2 censors, between Closed & Open loop systems ?
just spit-balling, or does a O2 sensor in the F.A.S.T. EFI not care
location of the censors, not on the bottom of the pipe
needs to be up the side or on top, so excessive moisture doesn't kill it
good luck
Correct. Actual AFR value doesn't change at all.
At one point I raised the idle setpoint to 14.7. But I honestly don't remember seeing what the injectors were doing. If I change the requested AFR to 14.6, then the computer will be happy and will leave the injector duty cycle where they are. I guess I should try and raise it to 15+ and see what they do. If the computer backs things off, then that helps prove that the actual AFR is "stuck".
From what I understand, the O2 sensor is a Bosch LSU4 type, reading wide band air/fuel ratios from 9:1 to 16:1. It's designed for closed-loop applications. So yes, there are differences in O2 sensors, and I think I have the correct replacements, but they are not FAST branded.
My O2 sensor location has not changed for 10 years since I built the car, and it has been a rock solid performer with over 10,000 miles until now. The sensor is installed in my right header collector region. In addition, swapping out O2 sensors with new ones leads to the same error. So I doubt sensor location is a problem.
Similar threads
