core-rider

For a few months now I have had a problem with pinging at part thottle. My truck is basically stock except for an FMS mass air kit and aftermarket exhuast. My timing is at 14* but it also did the same thing at 10*. I have always run 93 octane gas since I bought the truck.
My engine will ping at anywhere between 1/2 and 3/4 thottle. At full thottle it does fine, I have never heard it ping at full thottle. This confuses me because it goes against everything I've ever been told and seen.
This problem is even more noticable when I'm towing my boat. Have any of you ever had this sort of thing happen before? I would appreciate any input at all.

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Jason L.
Black '93 Lightning #439
Built 2/16/93
Lowered 2" f/r
Motorsport Mass-air
Custom exhaust

redlightningssf

Did you remember to disconnect the dohicky on the driver side that diconnects the computer while timing? Other wise the computer keeps the timing at around 10 degrees.Look through the archives under timing. Disregard this post if you did already. Later Alex

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#775 Red Black Bra 1/2Drop Kenne Bell 6# Blower
SVO Mass air kit
30# injectors
Hooker headers
Basanni Hi flow cats K-N filter B-M shift kit
97 Harley Heritage

GEN1_4_U_2_NV

Recently I had a sound under part throttle that was a lot like pinging, except it would only do it some times and then not do it for a couple of days and then there the pinging was again. My problem was a bad MAP sensor. Now my truck is all better. Just a thought.

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93 red Lightning
poly bushings
Timing @ 14*BTDC
rear exit exhaust
straight pipes
Under Drive Pulleys
Diesel Tube
180* thermostat
Downs Ford jump seat
Build #3949 of 5276
best time:15.031 @ 91.21MPH

Since last time at track:
Level 10 shift kit



OUR NEXT TARGET!! ALL YOUR BUTT'S ARE BELONG TO US!

svt450

I feel your pain. I too have the FMS mass air. They really lean out at WOT. I used to get some detonation in 3rd at partial until I got the inline pump hooked up. I would try to get a Fuel pressure guage hooked to it. It may be your regulator going bad. it might be keeping pressure too low at partial throttle but fine under WOT.
Just some thoughts!

Jason

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Jason
NLOC #441
Red 94
#1554
FMS Mass Air
Powerdyne,6PSI
190LPH Inline
Flow-masters
Dual Electric Fans
MSD BTM
14.02@98MPH SO FAR!!!!!!!

Now with Ranchos!!

www.maddogpyro.com (under construction)

Muddmann

errr, the SPOUT connector?


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'93 Lightning
-all the bolt-ons
-Jacobs ignition
-full exhaust
-Level 10 tranny
-TFS Stage II heads
-Kenne Bell Blowzilla
-357 Long-Rod on the brain...

if i stop runnin, the evil little clowns will get me...

Abby Normal

Where Y'at Jason, I had a problem just like that on my 302. It turned out to be dirty injectors. I used the cleaner in a bottle but had to bring it to a mechanic to clean them. I used Techron but alot of guys on here like the Redline cleaner.
I'd set the timing back to 10* till its fixed so you don't hurt the motor. Let us know what you find.

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Abby Normal
'92 F-150 302
Ford Performance Association Member
49 Cubes short of a full load!

Devin

Hey core rider,

I thought I had a detonation issue one time, turns out I was so dense it was my injectors making the noise and I thought it was "pinging." Man I went up and down walls over that.

Anyway, soooooooounds like you could use a fuel filter change. I've been told that 10,000 different times when the truck starts to ping. I've heard you need a special tool to wrench on the f.f., so I just took mine to a dealer and got it changed for 20 bucks or so.

Later bud, good luck!

Devin

double post

grrrr sorry

[This message has been edited by Devin (edited 01-05-2002).]

LIGHTNING2FAST

sounds to me like the egr system is not doing its job. it functions under light to moderate throttle to cool cylinders. but at full throttle it has no function. if its not working properly it would explain why the detonation is only at part throttle.

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Paul DelPo
94L, Black
P-DYNED 8lbs
ranchos
electric fans
1:7 rollers
detroit locker
full exhaust
2600 stall pi convertor
level 10 shift kit
12.79 @103 1.71 60ft
stock long block and injectors
coming soon: ys-trim, intercooled and lots o boost ; )

core-rider

Yeah, I already changed the filter awhile back and it did help some. I'm pretty certain it's not the injectors, if they make that much noise then they need to be redesigned. I would assume the injectors aren't dirty, because they're only 2 years old.
Maybe I will try some cleaner though. Guess I need to take a look at the EGR system as well. Thanks for the advise everyone.

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Jason L.
Black '93 Lightning #439
Built 2/16/93
Lowered 2" f/r
Motorsport Mass-air
Custom exhaust