throttle popping

[sho4life]

Its really cold here and it seems to do it below 2000 rpms. Also it does it when the gas pedal is pushed more than halfway. No cel light. i think the plugs are fouling? I used bosch +4 but people say there no good.

 

[sperold]

I am not sure what throttle popping means.
Is it like backfiring and stumbling?

 

[rubydist]

bosch +4 are not a good plug for the SHO motor.

if I understand your symptom, there is a good chance of a bad tps. pull the codes, because a bad tps will almost always set a code.

 

[frosho]

You have a misfire, which is causing a backfire. Make sure your plug wells are clean (no water, oil, debris, etc.) and put in some Motorcraft plugs. The Motorcraft part number is AGSP32FMF6 (also known as SP497).

Now, what was that about me being no help whatsoever?

Have a nice day. :sun:

 

[luigisho]

Change the plugs and clean the MAF filament just for fun. I have read about the +4s not performing well in these cars either. Hard to know for sure unless you change them out and it solves the problem.

 

[sho4life]

Not good that an expensive plug wouldnt last long.. Checking the plugs soon. thanks

 

[91PDXmocha]

Not surprised at all . Get those Bosch plugs out of there and put on motorcraft or double platinum Autolights .

 

[sho4life]

Someone said it was the tps sensor. Is that how they act up? only when the engine warms up? Cuz it runs great when cold.

 

[hawkeye18]

The reason the Bosch +4s do not run well is that the SHO, along with a few others, use what is called a waste spark ignition system. You will notice that there are only 3 coils on a car that has 6 spark plugs. Each coil fires 2 cylinders at the same time (1/6, 2/4, 3/5). On the cylinder that is supposed to fire, the spark will go from the anode (the tip) to the cathode (the arm). On the other cylinder - the one that is not producing power - the spark will travel from the cathode to the anode.

Because of this, a spark plug that is protected against spark degradation on both the anode and the cathode is required. The original plugs, AGSP32PP, have a PP at the end, which means double platinum - both the tip and the arm are coated in platinum, vs. just the tip (that's what she said) in a normal plug.

This is also why you can't use the Bosch +4s... they may have 4 arms surrounding the plug, but none of them are coated in platinum. Thus, every time an arc is generated from the arm to the tip, a little chunk of the arm is destroyed. Now imagine this in an engine that is turning 7,000rpm with two sparks per revolution... divide that by 6 and you get 2,333 sparks in each cylinder per minute, or about 39 a second.

Now maybe you see why those Bosch plugs don't work for very long.

Fortunately the solution is simple. Grab some Motorcraft AGSP32FM (the replacement for the discontinued PPs, and 98% as good), or some Autolite APP3924 (notice the PP?) plus, pop them in (remember, gap to .044") and you'll be good to go.

 

[sho4life]

Thank you!!! I can always count on you.