Poor fuel economy
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
I would suggest putting a timing light on it per the instruction label on the radiator support. See where it is set and if it advances. If it has TFI, ECM controlled ignition it may very well be stuck at base timing. That's easily a recipe for 7-9 mpg.
Proper spark advance might wake up the "mild" cam.
Proper spark advance might wake up the "mild" cam.
Mountain Pass
Joined: Oct 2015
Posts: 215
Likes: 4
From: Buffalo,Tx.
Need clarification.
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
Thread Starter
|
Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
Need clarification.
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
Thread Starter
|
Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
Need clarification.
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
You said you had the stock ignition system in it.
And that you had put a new ICU on it.
That means that you or the previous owner has not done the DS2 swap?
If you are still running a stock distributor with the ICU, that is a "Lot" of your problems.
Also do you still have the catalytic converter on? If so, it is probably clogged and needs to be removed so your engine can breathe....
Thread Starter
|
Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
No, like I stated before I the ICU/duraspark 2 systems
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
that would be the duraspark 3/eecm ignition system
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
I will post pictures when I get my truck back from the body shop. I have the duraspark system that plugs into my factory harness and then runs to my motor which splits into two different harnesses which runs to my ignition coil then to my distributor, the system is set up correctly as a duraspark 2 system should be
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Cargo Master
Joined: Sep 2006
Posts: 2,120
Likes: 390
From: Evansville, Indiana
Even so, the timing could be stuck. Pop the cap off and grab the rotor. Make sure it turns back and forth easily. The centrifugal weights could be binding.
Cargo Master
Joined: Sep 2006
Posts: 2,120
Likes: 390
From: Evansville, Indiana
As mentioned by others, the Duraspark II is your best choice for your formerly I-6 equipped truck.
Even so, the timing could be stuck. Pop the cap off and grab the rotor. Make sure it turns back and forth easily. The centrifugal weights could be binding.
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
I know the setup I currently have wouldn’t have been stock for 1985, my setup is like older models, that’s why I’m having a hard time figuring out the MPG issue, older 302s with the same setup got way better mpg than this, I’m think it probably the carb, the ignition system is correct
Lead Driver
Joined: Apr 2002
Posts: 5,335
Likes: 1,246
I know the setup I currently have wouldn’t have been stock for 1985, my setup is like older models, that’s why I’m having a hard time figuring out the MPG issue, older 302s with the same setup got way better mpg than this, I’m think it probably the carb, the ignition system is correct
Getting an original nonfeedback Motorcraft carb would be my preference and rebuilding it if needed would be my choice. I see some are available on ebay.
Also what jet size are you using? Are you at sea level or drive in the Rocky mountains?
Thread Starter
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Cross-Country
Joined: Nov 2023
Posts: 98
Likes: 3
Some people have had good results with the chinese knock off carbs. I think it can be hit and miss. Looking on Amazon I see multiple versions of the 2150. The one I happened to look at had a note, frequently returned item. I gambled once on a chinese carb for a gas weedeater. It was cheap but it only ran correctly a few times and then crapped out. I gave up on it and went battery powered weed whacker.
Getting an original nonfeedback Motorcraft carb would be my preference and rebuilding it if needed would be my choice. I see some are available on ebay.
Also what jet size are you using? Are you at sea level or drive in the Rocky mountains?
Getting an original nonfeedback Motorcraft carb would be my preference and rebuilding it if needed would be my choice. I see some are available on ebay.
Also what jet size are you using? Are you at sea level or drive in the Rocky mountains?
Lead Driver
Joined: Apr 2002
Posts: 5,335
Likes: 1,246
It's probably not your issue. Some have relocated to higher elevation with low elevation jets which can lead to crappy mpgs. Have you looked at Gary's garagemahal site for info on the 2150? He probably has a section on it. I know he has a section for the YF and YFA single bartel carbs. Take a look see.