Some first data from tonights run.
Personal thoughts are needs more top end and slow to idle down.
Personal thoughts are needs more top end and slow to idle down.
Data Recorded
- Thread starter ihpartsjeff
- Start date
ldo_marlin
Member
Jeff,
fuel is a little Rich but not bad. Did you save the log file? Need to see if any flags were set. What's initial timing? Any backfires ? Did you swap in my dist.?
fuel is a little Rich but not bad. Did you save the log file? Need to see if any flags were set. What's initial timing? Any backfires ? Did you swap in my dist.?
Currently running the system with the egr disconnected. I didn't save the log file. Initial timing is at @ 3*. No backfires. And yes this was with your distributor(the prototype distributor had a bad ignition module in it aside from the loose cap problem).
Bill USN-1
F.I. Moderator
New bin is sent.
Try it and lets get the fuel close without the egr.
Then when you have a clean run you can hook the egr up and we can see the difference.
Since it was Rich I would leave the timing. Your 3° is with the bypass unhooked correct.
If you check your timing with the the motor warm and everything hooked up, it would be idling at 18°.
Also reset the ECM before the next run.
Just unplug the connectors or the battery.
Use the datalogger button before starting and check all boxes except the raw box. Then hit start.
When done hit stop and also save the blm table.
Then send both files or post them.
Try it and lets get the fuel close without the egr.
Then when you have a clean run you can hook the egr up and we can see the difference.
Since it was Rich I would leave the timing. Your 3° is with the bypass unhooked correct.
If you check your timing with the the motor warm and everything hooked up, it would be idling at 18°.
Also reset the ECM before the next run.
Just unplug the connectors or the battery.
Use the datalogger button before starting and check all boxes except the raw box. Then hit start.
When done hit stop and also save the blm table.
Then send both files or post them.
ldo_marlin
Member
You already know how I feel about those distributors and the non-delco modules. Good that you solved the ignition problem.
I am flying out real early tomorrow and won't be back 'til wed. I'll try to program it tonight and put it in the mail for you. I have a new laptop and I have not programmed with it yet and I am hoping it won't fight me.
The 3* was with the bypass unhooked. What was weird at first the system was jumping back and forth from controlled to uncontrolled timing when I first unplugged the connector. It did that for awhile and then finally went into bypass mode after a few minutes. It actually wouldn't surprise me if I had an intermittently bad ECM as I did have communication problems the first few days. It wasn't until yesterday that I could finally get the system to communicate. The system didn't start communicating until I replaced the distributor so figure that one out???? I'll double check the timing today and perform another cold start as so far the cold starts haven't been that great but that could have been related to the distributor problem. I'll certainly log more data this weekend with this existing chip. Thanks for the new bin file
.Now I'm a believer
. That would be great if you could get me that new chip right away. Heading to the rubicon next weekend so it would be better to lean it out a bit for the trip.ldo_marlin
Member
Sounds like the est causing problems.
Your new chip is with the usps as of 4:30pm today.
Your new chip is with the usps as of 4:30pm today.
Rock Tractor
IHPA Tech Moderator
Bring your laptop tomorrow so we can log some data on mine
More data from the same chip but run yesterday for about 60 miles.
Bill USN-1
F.I. Moderator
Back the min idle screw out about 1 turn and then reset the tps.
ldo_marlin
Member
Bill - Jeff is complaining that his motor runs out of steam around 4000 rpm. With the q-jet it was willing to spin pass 4k without hesitation. Fp unknown right now. He's running a a bbc TBI and 350 injectors. He's also complaining that between gear changes, the motor is slow to spin down to idle. I looked at the iac count in the bin and it looks ok. What's your opinion?
I did this and reset the tps to .60 volts
What louis said. Also, the idle goes up too high when the a/c is turned on.
I just did a short run and logged data from the new chip. Its a little better on the top end but needs more and is still slow to idle down.
Bill USN-1
F.I. Moderator
I still need the numbers from the injectors to be sure of the size.
The numbers are not that bad on fuel. Bottom end is still a little Rich. Top end is not that far off but that is in closed loop.
In open loop in pe mode the afr is dropped to 12.5:1 so more fuel is added. Without a wideband o2 there just isn't a way to know for sure that the injectors aren't going lean.
We can look at injector pw later, once the fuel is trimmed out to see if they are going static.
Fuel pressure under load would be good to know.
The ac sense wire is there for oba or obw. There really isn't any need to hook it up to the ac since the iac will maintain the idle at the programmed rpm. Most factory chips are set to 0rpm increase when the ac is turned on. I set it to 500rpm increase so that it can be used for an idle increase either for the oba or for guys with a manual tranny that want to flip a switch and increase the idle speed while crawling. Then all they need to do is use the clutch and brake.
So you can either disconnect the ac sense wire or I can set it back to 0 increase when you turn on the ac.
The logged data is a little short but I can adjust it a little based on what you have.
At least I can lean the idle a little.
Tps looked like it was at 1.2%. Not bad but I think the idle screw could be back out another 1/2 turn. Then recheck the tps. Iac counts aren't 0 anymore but still pretty low.
A little more temp out there and they will probably bottom out.
Let me know on the ac rpm and the inj numbers and I will make a few more adjustments.
Also noticed the engine was already at temp when the log was started.
The numbers are not that bad on fuel. Bottom end is still a little Rich. Top end is not that far off but that is in closed loop.
In open loop in pe mode the afr is dropped to 12.5:1 so more fuel is added. Without a wideband o2 there just isn't a way to know for sure that the injectors aren't going lean.
We can look at injector pw later, once the fuel is trimmed out to see if they are going static.
Fuel pressure under load would be good to know.
The ac sense wire is there for oba or obw. There really isn't any need to hook it up to the ac since the iac will maintain the idle at the programmed rpm. Most factory chips are set to 0rpm increase when the ac is turned on. I set it to 500rpm increase so that it can be used for an idle increase either for the oba or for guys with a manual tranny that want to flip a switch and increase the idle speed while crawling. Then all they need to do is use the clutch and brake.
So you can either disconnect the ac sense wire or I can set it back to 0 increase when you turn on the ac.
The logged data is a little short but I can adjust it a little based on what you have.
At least I can lean the idle a little.
Tps looked like it was at 1.2%. Not bad but I think the idle screw could be back out another 1/2 turn. Then recheck the tps. Iac counts aren't 0 anymore but still pretty low.
A little more temp out there and they will probably bottom out.
Let me know on the ac rpm and the inj numbers and I will make a few more adjustments.
Also noticed the engine was already at temp when the log was started.
Let me log more data with this chip and get you fuel pressure and injector numbers. At first I couldn't get my laptop to communicate hence the reason the data started after the vehicle was warmed up. No dropping the idle more. The throttle plates are already just about slamming shut. I did back it off the turn you requested but then the the throttle plates would stick closed so I had to bump it back up enough so it wouldn't stick. I'll disconnect the a/c wire(was going to anyway). I'll get more data on this chip since the data logging run I did was so short.
Bill USN-1
F.I. Moderator
Sounds good.
You May want to do another check of all your vacuum connections and look for any excess. It should idle down further without the plates going closed.
Do you have vacuum brakes?
Pcv still rattles?
Etc....
You May want to do another check of all your vacuum connections and look for any excess. It should idle down further without the plates going closed.
Do you have vacuum brakes?
Pcv still rattles?
Etc....
I'm certain that there are no vacuum leaks. With the fuel injection there's not a whole lot of vacuum lines - just pvc, vac gauge, and the hose going to the charcoal canister(the canister is tee'd off of a port with a pin hole). I'm also running hydroboost so no vac brake booster. I'll double check the pcv and make sure it hasn't gone bad(seen them bad right out of the box).
Bill USN-1
F.I. Moderator
Ok new bin sent.
Adjusted fuel and took the rpm out of the ac.
Give it a try.
The fuel should be getting pretty close.
Adjusted fuel and took the rpm out of the ac.
Give it a try.
The fuel should be getting pretty close.
ldo_marlin
Member
Bill - what parameter(s) in tunercat sets the cold start rpm? Jeff tells me his rpm is around 1500 at cold start and takes long to come down to idle rpm.
Any ideas on the other problem he has with the motor slow to spin down to idle between gear changes. He also has a brief run-on condition after he take his foot the gas. Like the pedal was sticking. Both problems are probably related.
Any ideas on the other problem he has with the motor slow to spin down to idle between gear changes. He also has a brief run-on condition after he take his foot the gas. Like the pedal was sticking. Both problems are probably related.
Bill USN-1
F.I. Moderator
Mostly iac steps/temp.
I sent another bin with some adjustments to the throttle follower more in line withthe asdu I normally use.
See if it helps with the gear change rpm.
You can try both bins and see if there is much difference.
The factory held the rpms up a little for a smoother shift.
I sent another bin with some adjustments to the throttle follower more in line withthe asdu I normally use.
See if it helps with the gear change rpm.
You can try both bins and see if there is much difference.
The factory held the rpms up a little for a smoother shift.
Bill USN-1
F.I. Moderator
New data?
Burned chips?
Ran the con?
Burned chips?
Ran the con?