ground is good There is not cats just headers and trush mufflers. I have changed plug wires and plugs, coil, cap and rotor
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ground is good There is not cats just headers and trush mufflers. I have changed plug wires and plugs, coil, cap and rotor
Bob, feel for you, but on the brighter side you will know the system inside out before long. Also it is difficult to gauge what you do and don't know so please don't take offence if I say some really obvious stuff, just trying to help.
Efi is bullet proof when everything works, it will not work if it cannot measure key parameters accurately in a certain period of time.
Any parameters it is not measuring either directly or indirectly, it will use tables of "expected" values to calculate the fuel corrections. If these values are NOT as expected it will generally adjust what it is controlling and wait for a response from what it is measuring, if it does not get the expected outcome it will er on the safe side and make a rich situation. Think picking up an eggshell, but you cannot feel it and you cannot drop it, you squeeze harder and probably break it.
From memory your efi uses hot side water temperature, O2 sensor, throttle position sensor. Some of the assumptions it is making it that there are no air leaks around the intake, good air flow through the air intake, ignition is firing at the right time for the right cylinder, there is no air or exhaust leak between the cylinder and the O2 probe. All of these parameter and some others then allow calculation of the correct change of fuel addition to target the desired air fuel ratio which is the self learning process.
I don't thing the parameters somewhere in the system are close enough to get the self learning working properly, the efi is then either going rich because it thinks it is lean, or it is going open loop because it can't figure out what is going on, and this also results in a rich condition.
If it was my money, I would be looking at something other than the efi causing the rich condition given that the problem happened with the carbs as well.
I would check for vacuum leaks around the intake and I would absolutely make sure the ignition is right. Can the cam cause the problem? Is the sump pressuring causing oil blow by? Do you have a temp gun to shoot temps of the exhaust manifold to see if there is a problem cylinder with either high or low temp?
The O2 sensor you mentioned is covered in soot. Is it a self heating sensor or does it require the exhaust temp to heat it. The sensor needs to get up about 600 F to work properly and burn off any buildup. If there is anything on the sensor it will read a lean condition. Contaminants such as silicon, carbon, grease, oil, even finger prints can cause issues. You maybe able to clean the probe, but you may never know if is clean enough, or if it has been damaged.
On another forum I go onto, a Ferrari was having misfire issues, when they added an extra earth wire from the O2 sensor to the chassis, the misfire went away... They tried this because they couldn't measure any voltage or resistance issues, just something to eliminate.
Good luck
Bob---------If you want to solve this and are willing to work with me via PM, (I know you are with RS) and for a short period of time, exclusively follow the procedures I suggest, I am willing to help you further-------You are new here so probably don't know anything about my background , so you can google Keeling & Clayton California Charger and go from there-there are people on here fully aware of where and what I've done, and it creates more problems with some than it helps with others---
You can ask the people at Edelbrock about us and you can start at Vic himself or for this ask Chris Johnson( he used to be at Diablo? before Edelbrock)
Am going to give Edelblock a chance. But winter is coming so time is about up for driving. I got a new MSD Pro Bullet Distributor and the MSD Digital 6 box ill see what happens and let everyone know.
Bob,Quote:
Originally Posted by bobsundance
I think what you're saying is that you're going to work with Edelbrock (now that you have the right point of contact and he's back in the saddle this week); and that your ignition is now a new MSD distributor and new MSD box, right? No disrespect, but it gets really confusing with no capitals/punctuation to break the words into the sentences you intend. It makes reading a post a guessing game, and your meaning can easily be misunderstood.
Talked to Mark at Edelbock, finally after playing phone tag, He wants to see the ECU readings while the engine is running, says the window for the EFI working right is small because of the engine and cam. Says we can work it out buy should have used the multi port injection. Good god!! clean the plugs, load on the trailer to move her 6 miles to a hard ball road. I used the throttle body because it looks like a carb and I have had a good usage report from edelblock. Now I just don't understand NOONE ever said don't use this or that, with this or so forth. Now Edelblock says don't use the ground off the MSD unit from a Digital 6A box to the car tach, and to call MSD, and MSD says its fine to use it for both. 40 K into the build and still cant drive her
Maybe give Jerry a try?
From my experience you should listen to Edelbrock about the wiring, especially about grounds where you can get ground loop gremlins working. You know now that MarkH is their guru for the E-Street you're working with and you've got his attention so trust him and follow his lead. Edelbrock has lots of guys who may be expert about fuel injection, but like most places they have product line experts, and that's Mark for E-Street.Quote:
Originally Posted by bobsundance
How'd you turn out on all the issues you were having with your engine?
Ditto. This was a real head scratcher, and some closure would be most welcome!Quote:
Originally Posted by 40FordDeluxe