stangrcr1
NAXJA Forum User
- Location
- marysville, WA
After searching and reading all the threads I could find on pinging, I decided to ask.
1987 Renix Auto with most electronics replaced/adjusted. New TPS set at 83%, CPS, O2 sensor, MAP, coolant and air temp sensors, knock sensor, new orange top Ford injectors, new fuel pump (fuel pressure is by the book - 31psi/39psi). Ignition timing shows 14 degrees advance at idle(800rpm) and 30 degrees around 2500rpm. Runs great and gets 16mpg on my daily commutes (9 miles each way) and around town. Passed emissions with really low numbers. EGR diaphragm is blown, but valve stays shut. Vacuum line to EGR solenoid plugged.
Anyway, at low load/rpm, it is nice and quiet. No noticeable pinging, but put a load on it, and she pings bad. Constant pinging at highway speeds (anytime over 50mph). Yes constant.
I can't tell for sure when this started as I changed a bunch of parts at the same time. The XJ has been pinging since we bought it July 07, but never this bad. It also has a 180 degree thermostat, from the previous owner (could it be in constant warmup mode?), 93up radiator,hoses,expansion tank, Bosch Platinum plugs, Highly modified Pacesetter header, new high flow generic cat and Magnaflow catback exhaust. Intake is still stock.
I know the computer controls the timing and there is "no" adjustment, but are those numbers right? Is that too much advance?
I have tried Seafoaming the engine twice with no noticeable change, except the black mark on the driveway getting bigger and probably killing the new cat.
Any ideas?
1987 Renix Auto with most electronics replaced/adjusted. New TPS set at 83%, CPS, O2 sensor, MAP, coolant and air temp sensors, knock sensor, new orange top Ford injectors, new fuel pump (fuel pressure is by the book - 31psi/39psi). Ignition timing shows 14 degrees advance at idle(800rpm) and 30 degrees around 2500rpm. Runs great and gets 16mpg on my daily commutes (9 miles each way) and around town. Passed emissions with really low numbers. EGR diaphragm is blown, but valve stays shut. Vacuum line to EGR solenoid plugged.
Anyway, at low load/rpm, it is nice and quiet. No noticeable pinging, but put a load on it, and she pings bad. Constant pinging at highway speeds (anytime over 50mph). Yes constant.
I can't tell for sure when this started as I changed a bunch of parts at the same time. The XJ has been pinging since we bought it July 07, but never this bad. It also has a 180 degree thermostat, from the previous owner (could it be in constant warmup mode?), 93up radiator,hoses,expansion tank, Bosch Platinum plugs, Highly modified Pacesetter header, new high flow generic cat and Magnaflow catback exhaust. Intake is still stock.
I know the computer controls the timing and there is "no" adjustment, but are those numbers right? Is that too much advance?
I have tried Seafoaming the engine twice with no noticeable change, except the black mark on the driveway getting bigger and probably killing the new cat.
Any ideas?