LEAN POP THROUGH INTAKE!!!!!!! HELP !!!!!!

5ohCOUPE · 09-07-2001, 09:04 PM

EVER SENCE I PUT CAM, HEADS, AND INTAKE ON THE CAR IT HAS AN INTERMITTENT LEAN POP AND SLUGGISH OR A LEAN FEELING PART THROTTLE TAKE OFF. THE TIMING IS AT 14, I HAVE GOOD FUEL PRESSURE, NO VACCUM LEAKS, ALL SENSORS ARE GOOD. I HAVE NEW O2'S, NEW MASS AIR SENSOR. THE THING RUNS GOOD AT WIDE OPEN THROTTLE BUT SOMETIMES IT JUST FEELS REALLY SLUGGISH AND IT WILL LEAN POP THROUGH INTAKE ON PART THROTTLE. I HAVE 73 MM C&L AND 70 MM MAC TB. ANY IDEAS WHERE I CAN START ????

84LX89GT · 09-08-2001, 07:09 PM

are you absolutely 100% sure there's no vacuum leaks. Try getting a small bottle of propane and hook up a hose and run it around and see if the idle picks up. When do you specifically remember this problem starting? Good luck,

Unit 5302 · 09-08-2001, 09:15 PM

A backfire through the intake? Are you sure? What mods do you have?

5ohCOUPE · 09-09-2001, 11:08 AM

i have winsor jr heads. gt 40 intake, ported lower. lunati cam. 70 mm tb. 73 mm c&l

srv1 · 09-09-2001, 11:33 AM

5oh, check your firing order, its sounds like you got some wires in the wrong place.

srv1 · 09-09-2001, 11:34 AM

oh i almost forgot, what kind of rockers do you have, bolt down, or studs? if you have studs, the check your valve adjustments

------------------
90 LX Black on Black
Flowbabies, h-pipe, Mac unequal shorties, K&N, Hurst, subframes, Motorsport springs, MSD coil

Unit 5302 · 09-09-2001, 11:37 AM

Quote:

Originally posted by srv1:
5oh, check your firing order, its sounds like you got some wires in the wrong place.

I would think having wires in the wrong place would cause it to run pretty lousy wide open too. LOL.

If it's popping through the intake, perhaps the cam was indexed wrong, or one of the valves is sticky.

If it really just sounds like the intake, (stock exhaust makes backfires really quiet) I'd be inclined to think an injector might be sticking.

What fuel pump, fuel pressure regulator, injectors do you have?

5ohCOUPE · 09-09-2001, 12:55 PM

the heads are new and i have stud type rockers. i checked the valve adjustment and it is ok. i run fuel pressure at 39 to 40 psi. i have 190 gph pump. and i have 19 lb injectors. i am beginning to think it is the cam. i have changed everything but the air intake sensor but it is ok. it didnt start this until i did the mods to it. but i put stock intake back on it and it still does it.

09-07-2001, 09:04 PM	#1
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	LEAN POP THROUGH INTAKE!!!!!!! HELP !!!!!! EVER SENCE I PUT CAM, HEADS, AND INTAKE ON THE CAR IT HAS AN INTERMITTENT LEAN POP AND SLUGGISH OR A LEAN FEELING PART THROTTLE TAKE OFF. THE TIMING IS AT 14, I HAVE GOOD FUEL PRESSURE, NO VACCUM LEAKS, ALL SENSORS ARE GOOD. I HAVE NEW O2'S, NEW MASS AIR SENSOR. THE THING RUNS GOOD AT WIDE OPEN THROTTLE BUT SOMETIMES IT JUST FEELS REALLY SLUGGISH AND IT WILL LEAN POP THROUGH INTAKE ON PART THROTTLE. I HAVE 73 MM C&L AND 70 MM MAC TB. ANY IDEAS WHERE I CAN START ????

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09-08-2001, 07:09 PM	#2
84LX89GT Mustangs Join Date: Jul 2000 Posts: 1,938	are you absolutely 100% sure there's no vacuum leaks. Try getting a small bottle of propane and hook up a hose and run it around and see if the idle picks up. When do you specifically remember this problem starting? Good luck,

09-08-2001, 09:15 PM	#3
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	A backfire through the intake? Are you sure? What mods do you have?

09-09-2001, 11:08 AM	#4
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	i have winsor jr heads. gt 40 intake, ported lower. lunati cam. 70 mm tb. 73 mm c&l

09-09-2001, 11:33 AM	#5
srv1 Get down..... Join Date: Apr 2001 Location: Room 103 Posts: 2,095	5oh, check your firing order, its sounds like you got some wires in the wrong place.

09-09-2001, 11:34 AM	#6
srv1 Get down..... Join Date: Apr 2001 Location: Room 103 Posts: 2,095	oh i almost forgot, what kind of rockers do you have, bolt down, or studs? if you have studs, the check your valve adjustments ------------------ 90 LX Black on Black Flowbabies, h-pipe, Mac unequal shorties, K&N, Hurst, subframes, Motorsport springs, MSD coil

09-09-2001, 12:55 PM	#8
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	the heads are new and i have stud type rockers. i checked the valve adjustment and it is ok. i run fuel pressure at 39 to 40 psi. i have 190 gph pump. and i have 19 lb injectors. i am beginning to think it is the cam. i have changed everything but the air intake sensor but it is ok. it didnt start this until i did the mods to it. but i put stock intake back on it and it still does it.