popping

nitrousstang88 · 08-22-2006, 08:01 PM

i have an 88gt with a slight popping problem if i am just driving normal in any gear and just floor it my car pops and then starts to pull at first i thought that it was a needed tune up but even after the tune up it is still doing it

it has speed density and i have a gt40 intake , a upr cold air intake , pulleys , x pipe , and flomaster cat back

Saleen S330 · 08-24-2006, 11:01 AM

What the timing set at and how many miles are on the timing chain?

spike_africa · 08-24-2006, 11:10 AM

could be a weak fuel pump because of the fact it does it at WOT only would lead me that way. You can barrow a guage from autozone ot check the fuel pressure on your motor.

Saleen S330 · 08-24-2006, 11:20 AM

If the pressure if at 42 psi and you floor it, i though it stayed at 42 psi?

csledd · 08-24-2006, 11:26 AM

hmm.. when my car was missing it would make a popping noise and was a lot slower than it should be when I tried to go WOT

Saleen S330 · 08-24-2006, 05:40 PM

When i bought my NGK's they're suppose to be pregapped and it says not to gap them or you could damage them. well i installed them and for some reason when i would get on it, and it hit 3K-4K rpms wit was missing real bad. i checked the gap and it was almost .60, so i carefully regapped them to .45 and it ran like a champ.

I was wanting to know about the timing chain cause after so many miles, at WOT it can stretch and throw your timing off pretty good and make it run like that.

oh, and when my valves on #2 and #7 were burnt, coolant sensor popped out and all the coolant came out, i know it was running bad, popping, no power at all.

cobra1923 · 08-25-2006, 09:20 AM

Check your plugs, I would think that popping at WOT would be from loading up the plugs (either a sudden rich condition) or a weak spark (from timing or physical plug problem). Too many mods on a speed density could cause problems but your list doesn't look too crazy yet.

cobra1923 · 08-25-2006, 09:25 AM

Quote:

Originally Posted by Saleen S330

If the pressure if at 42 psi and you floor it, i though it stayed at 42 psi?

The fuel pressure regulator is vacuum sensitive. If the pressure was adjusted to 42 with the vacuum line detached (like you're supposed to), then at full throttle it would be at 42. If it was set to 42 with the vacuum line attached and running, then at full throttle it would jump to something higher... I think this is right? It's been awhile since I've got to play on a 5.0

spike_africa · 08-25-2006, 11:51 AM

when you give it gas the psi goes up in EFI to feed the injectors more fuel (for the newbies to cars

). if it stays the same there is a fuel or regulator problem.

98StangGT · 08-25-2006, 10:37 PM

does exhaust leak, make a car pop? what else can a exhaust leak make your car do?

GREG@SN95 · 08-26-2006, 11:04 AM

fuel problem...

check fuel pressure regulator
could have a bad injector
timing could be funny

sounds like its starvin to me

Cobra King · 08-26-2006, 11:16 PM

fuel problem. Either your plugs/wires are bad or you just have clogged injector/fuel filter/pump.

nitrousstang88 · 08-28-2006, 06:21 AM

it still has a stock timing chain with 76,000 miles on it i replaced the fuel pump and i just put a brand new set of ford racing plug wires i just have not had time to replace the plugs i also just put a cap , rotor , throttle position sensor , fuel filter

spike_africa · 08-28-2006, 09:19 AM

did you check the fuel PSI with a guage yet? this would help rule out alot of things.

Saleen S330 · 08-28-2006, 10:13 AM

Quote:

Originally Posted by cobra1923

The fuel pressure regulator is vacuum sensitive. If the pressure was adjusted to 42 with the vacuum line detached (like you're supposed to), then at full throttle it would be at 42. If it was set to 42 with the vacuum line attached and running, then at full throttle it would jump to something higher... I think this is right? It's been awhile since I've got to play on a 5.0

that's what i was thinking.

I would check the timing chain also to see if it's stretched.

nitrousstang88 · 08-29-2006, 05:37 AM

i have not checked the fuel pressure yet but i intend to do that in the next few days

cobra1923 · 08-29-2006, 08:21 AM

I'm sure you got the firing order right.. but admittedly, I have screwed it up before by not paying close attention.

Saleen S330 · 08-29-2006, 08:25 AM

Quote:

Originally Posted by cobra1923

I'm sure you got the firing order right.. but admittedly, I have screwed it up before by not paying close attention.

+1 on that one. i remember mine running weak but no popping. but after that i marked them.

rebelyell · 08-29-2006, 11:20 PM

This probably won't help but, I had the same problem with my 88 GMC truck when I gassed it. Turned out to be my starter cable was loose and arching. Just in case you may want to check that connection. It was arcing and I would lose power and popping and, it really sounded crazy. new cable and tighten up, ran good as new. FYI..

08-22-2006, 08:01 PM	#1 (permalink)
nitrousstang88 Junior Member Join Date: Aug 2006 Location: massachusetts Posts: 6	popping i have an 88gt with a slight popping problem if i am just driving normal in any gear and just floor it my car pops and then starts to pull at first i thought that it was a needed tune up but even after the tune up it is still doing it it has speed density and i have a gt40 intake , a upr cold air intake , pulleys , x pipe , and flomaster cat back

08-24-2006, 11:10 AM	#3 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,078	could be a weak fuel pump because of the fact it does it at WOT only would lead me that way. You can barrow a guage from autozone ot check the fuel pressure on your motor. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

08-24-2006, 11:26 AM	#5 (permalink)
csledd DSG!!! Join Date: Feb 2005 Location: Paducah, KY Posts: 3,074	hmm.. when my car was missing it would make a popping noise and was a lot slower than it should be when I tried to go WOT __________________ CAP DSG Registry 2003 Mustang GT - daily driven check out my cardomain for more info 296 rwhp / 310 rwtq Money spent @ AM: $4623.20 1984 Mustang Hatch - low budget project

08-25-2006, 09:20 AM	#7 (permalink)
cobra1923 Senior Member Join Date: Nov 2004 Location: Baltimore Posts: 572	Check your plugs, I would think that popping at WOT would be from loading up the plugs (either a sudden rich condition) or a weak spark (from timing or physical plug problem). Too many mods on a speed density could cause problems but your list doesn't look too crazy yet. __________________ 2003 10th Anniversary Cobra Convertible All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness 1995 mustang GT vert - all black (almost back together)

08-25-2006, 11:51 AM	#9 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,078	when you give it gas the psi goes up in EFI to feed the injectors more fuel (for the newbies to cars ). if it stays the same there is a fuel or regulator problem. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

08-24-2006, 11:01 AM	#2 (permalink)
Saleen S330 Banned Join Date: Jan 2006 Location: Sumter, SC Posts: 900	What the timing set at and how many miles are on the timing chain?

08-24-2006, 11:20 AM	#4 (permalink)
Saleen S330 Banned Join Date: Jan 2006 Location: Sumter, SC Posts: 900	If the pressure if at 42 psi and you floor it, i though it stayed at 42 psi?

08-24-2006, 05:40 PM	#6 (permalink)
Saleen S330 Banned Join Date: Jan 2006 Location: Sumter, SC Posts: 900	When i bought my NGK's they're suppose to be pregapped and it says not to gap them or you could damage them. well i installed them and for some reason when i would get on it, and it hit 3K-4K rpms wit was missing real bad. i checked the gap and it was almost .60, so i carefully regapped them to .45 and it ran like a champ. I was wanting to know about the timing chain cause after so many miles, at WOT it can stretch and throw your timing off pretty good and make it run like that. oh, and when my valves on #2 and #7 were burnt, coolant sensor popped out and all the coolant came out, i know it was running bad, popping, no power at all.

08-25-2006, 10:37 PM	#10 (permalink)
98StangGT Junior Member Join Date: Aug 2006 Posts: 10	does exhaust leak, make a car pop? what else can a exhaust leak make your car do?

08-26-2006, 11:04 AM	#11 (permalink)
GREG@SN95 Banned Join Date: May 2006 Location: JACKSON NJ Posts: 4,135	fuel problem... check fuel pressure regulator could have a bad injector timing could be funny sounds like its starvin to me

08-26-2006, 11:16 PM	#12 (permalink)
Cobra King Banned Join Date: Jul 2006 Posts: 103	fuel problem. Either your plugs/wires are bad or you just have clogged injector/fuel filter/pump.

08-28-2006, 06:21 AM	#13 (permalink)
nitrousstang88 Junior Member Join Date: Aug 2006 Location: massachusetts Posts: 6	it still has a stock timing chain with 76,000 miles on it i replaced the fuel pump and i just put a brand new set of ford racing plug wires i just have not had time to replace the plugs i also just put a cap , rotor , throttle position sensor , fuel filter

08-28-2006, 09:19 AM	#14 (permalink)
spike_africa Administrator Join Date: Sep 2004 Location: Orlando,Florida Posts: 7,078	did you check the fuel PSI with a guage yet? this would help rule out alot of things. __________________ Dustin 2002 GT Mustang 5-Speed Drag Radials,Sprayed,Powershifted WOOO HOOOO!

08-29-2006, 05:37 AM	#16 (permalink)
nitrousstang88 Junior Member Join Date: Aug 2006 Location: massachusetts Posts: 6	i have not checked the fuel pressure yet but i intend to do that in the next few days

08-29-2006, 08:21 AM	#17 (permalink)
cobra1923 Senior Member Join Date: Nov 2004 Location: Baltimore Posts: 572	I'm sure you got the firing order right.. but admittedly, I have screwed it up before by not paying close attention. __________________ 2003 10th Anniversary Cobra Convertible All Stock and staying that way... well maybe some pipes since it's so quiet..ahhhh! it's a sickness 1995 mustang GT vert - all black (almost back together)

08-29-2006, 11:20 PM	#19 (permalink)
rebelyell unofficial philosopher Join Date: Oct 2004 Location: Fayetteville, NC Posts: 1,788	This probably won't help but, I had the same problem with my 88 GMC truck when I gassed it. Turned out to be my starter cable was loose and arching. Just in case you may want to check that connection. It was arcing and I would lose power and popping and, it really sounded crazy. new cable and tighten up, ran good as new. FYI.. __________________ 2004 Torch Red GT Mach 1 Chin Spoiler "4.6 L V8" Side Stripes Mach 1 Hood stripe Black shorty antenna Flowmaster catbacks

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