Hessitation past 4K RPM.. Help..

[BMWLOCO]

Pull the plugs when your car dies...I bet they are completely wet because of the 19# injectors.

This started BEFORE I put in the Mustang Injectors. I'll pull them to see if that's an issue regardless.

Thx..

[BMWLOCO]

did you try changing the main relay? just a thought, but i had one go bad intermitantly and it had the same effects your describing.

I replaced the main relay with another one laying around that I pulled form a junkyard a month ago. It ran good for a few days, and went out again. I'll swap the old one back in to check.

Thx..

[maximapitko]

Sputtering at high rpm and it dies? A possibility would be a clogged exhaust. Remove the o2 sensor and take it for a spin. Let me know...

[jlevie]

Sputtering at high rpm and it dies? A possibility would be a clogged exhaust. Remove the o2 sensor and take it for a spin. Let me know...

A better test is to temporarily replace the O2 sensor with a pressure gauge. Anything over 1.5-2psi back pressure is bad.

[IRON-E]

Maybe I'm just reaching but how about the AFM? It could be clogged too. Check for busted fuel lines, and vacuum leaks.

[jlevie]

What you need to do is to see what the rail pressure is when the engine is misbehaving. Tee a pressure gauge into the rail feed line and zip tie the gauge to the driver's windshield wiper.

[BMWLOCO]

Thanks to all..

So far, after the new single stem plugs, the car is running better. I ordered a new FPR and put that in this AM and went for a long drive. A few WOT pulls, and etc..

The car is running good. No hesitation, and no sputtering. I think I'm good..

More updates as needed.. Thanks again!

[E30_fiend]

After reading the thread I was going to ask which plugs you used but then you answered the question.

Those two, three and four prong plugs are a joke. No good for any car. Just a marketing scam. People automatically think,"more prongs equals more spark which equals MOAR POWA!" But in reality, electricity finds the closest route to ground. It will choose its path down one prong and keep using it. Rendering the other prongs useless.

Glad you figured it out though.


Taylor