'02 4.6 Ignition timing retarding under load/ throttle
#1
12-17-2021, 07:38 PM
'02 4.6 Ignition timing retarding under load/ throttle
Truck is an '02 F150, 2WD.
The acceleration on this thing has never been great, but it seems to have gotten worse over the past months.
It accelerates at pretty much the same rate, regardless of throttle input.
Today I hooked it up to the scanner at work and looked at the parameters, and I noticed that when given more than about 20% throttle input, the ignition timing retards to less than 10 degrees BTDC, and at full throttle even got as low as -3 degrees.
It will cruise along at about 15-17 degrees at 65 mph, but as soon as you try to accelerate even a little bit, the timing backs off again.
The engine is completely stock internally, Motorcraft plugs have about 10k miles on them, runs right at 180 degrees all the time, no exhaust restrictions, factory tire size and gear ratio.
The only modifications are long-tube headers, J-Mod, and a K&N cold air intake.
Ask any questions you need; any help is appreciated.
The acceleration on this thing has never been great, but it seems to have gotten worse over the past months.
It accelerates at pretty much the same rate, regardless of throttle input.
Today I hooked it up to the scanner at work and looked at the parameters, and I noticed that when given more than about 20% throttle input, the ignition timing retards to less than 10 degrees BTDC, and at full throttle even got as low as -3 degrees.
It will cruise along at about 15-17 degrees at 65 mph, but as soon as you try to accelerate even a little bit, the timing backs off again.
The engine is completely stock internally, Motorcraft plugs have about 10k miles on them, runs right at 180 degrees all the time, no exhaust restrictions, factory tire size and gear ratio.
The only modifications are long-tube headers, J-Mod, and a K&N cold air intake.
Ask any questions you need; any help is appreciated.
#2
12-17-2021, 09:05 PM
Try it with premium gas. If it doesn't retard as far you may have a flaky knock sensor or you have excessive combustion chamber deposits. 180 is too cold, you should be running a 192 thermostat.
You aren't going to like hearing this, but get rid of that K&N and put the stock intake back on with a Gotts mod and a dry paper filter. Then clean or replace the MAF sensor.
https://www.f150online.com/forums/ar...3-f-150-a.html
You aren't going to like hearing this, but get rid of that K&N and put the stock intake back on with a Gotts mod and a dry paper filter. Then clean or replace the MAF sensor.
https://www.f150online.com/forums/ar...3-f-150-a.html