My5.0 is Sluggish and popping in low rpms ?

cornellm5 · October 24th, 2011, 01:29 PM

I have a 306 heads and cam full bolt-ons and when I drive my car it's real sluggish and pops from the exhaust then when I get past 4 grand it's perfect so what can I do to fix this problem would a tune do it ?

428CJ · October 24th, 2011, 05:40 PM

My car does the same thing, Check your fuel pressure.

cornellm5 · October 24th, 2011, 06:12 PM

I raised my fpr to 45psi

ryanw · October 24th, 2011, 07:54 PM

check your codes and fuel pressure. your fuel pressure should be around 39 psi with the vacuum line disconected from the fuel pressure reg.

cornellm5 · October 25th, 2011, 08:25 AM

I did that and it's at 39 psi would me not having a better fuel pump cause this cause I still have the stock one n

mayosailor27 · October 25th, 2011, 08:53 AM

run codes, check timing, test coil, check o2 sensors. I had the same problem. turned out to be timing being off. sometimes a bad coil can do that. once it heat's up, the circuit opens.... low rpms arent needing as much spark. high rpms, youll see-- try it out

cornellm5 · October 25th, 2011, 01:49 PM

And my timing is set to stock would that change anything if a heads and cam car timing is stock

ryanw · October 25th, 2011, 05:24 PM

It's possible that your balancer has spun And your timing is not reading correct. What codes showed up. Did you check yet?

cornellm5 · October 25th, 2011, 05:41 PM

No code is showing I have a 87 and no engine light is on or anything

steveofire · October 25th, 2011, 07:28 PM

just a thought but have you cleaned the maf lately I fixed a lot of cars that had a dirty maf on it one was a van that wouldn't rev past 3k it would just pop and no power I cleaned it and ran like a brand new van and it didn't throw a code

ryanw · October 25th, 2011, 08:27 PM

^ good point, id try that, but i would have thought a code would have shown up for that

steveofire · October 25th, 2011, 10:24 PM

I here ya my 94 did kind of the same thing with a turbo setup but it started to run on the rich side and was doing some of the same things never got a code and I finally tracked it down to one side was nice and clean and the other was coated with dirt lol

cornellm5 · October 26th, 2011, 11:26 AM

Originally Posted by steveofire

just a thought but have you cleaned the maf lately I fixed a lot of cars that had a dirty maf on it one was a van that wouldn't rev past 3k it would just pop and no power I cleaned it and ran like a brand new van and it didn't throw a code

My maf is new

cornellm5 · October 26th, 2011, 11:30 AM

I'm gonna change out my 02 sensor as well cause when I first put the motor in with the cam I have it was dumping alot of fuel and kept fouling out the spark plugs I went thru two sets so I didn't the maf conversion so I'm guessing all that fuel that was coming out of my pipe could have messed up my 02 sensors

SNmustang95 · October 26th, 2011, 11:47 AM

This happened when my maf was going bad. Unplug it, and go for a quick drive and see what it does. It really might be your maf, even if it's new, the wire could have been touched and messed it up.

primetizzle · October 26th, 2011, 01:42 PM

Okay wow I have the same exact problem...same engine also, 306 with just about every bolt on. When my car is cold it runs like shit- pops, stutters, back fires...but once my check engine light kicks on it runs like a champ...more then one person suggested cleaning the MAF, I decided to just replace it with the BBK 76mm CAI calibrated MAF...still same issues tho :/ what do you guys think?

steveofire · October 26th, 2011, 02:01 PM

Originally Posted by primetizzle

Okay wow I have the same exact problem...same engine also, 306 with just about every bolt on. When my car is cold it runs like shit- pops, stutters, back fires...but once my check engine light kicks on it runs like a champ...more then one person suggested cleaning the MAF, I decided to just replace it with the BBK 76mm CAI calibrated MAF...still same issues tho :/ what do you guys think?

What codes are you getting when the cel comes on ?

ryanw · October 26th, 2011, 07:58 PM

If the o2 sensors were making your car run lean or rich, a code should be showing. Make sure that your check engine light is not burnt out, cuz you should have some codes, even if code 11 pops up wich means all system pass

steveofire · October 28th, 2011, 12:18 PM

a couple other things you could check is check the tps make sure it has a nice sweep on a volt meter and u can check the voltage on the maf to make sure it has a clean sweep also and if you have a fuel pressure gauge hook it up and try to put it so you can see it or just take the hood off and mount it and go out and get on it under a load and make sure your fuel pressure isn't dropping off under the high loads

primetizzle · January 1st, 2012, 01:18 PM

Originally Posted by mayosailor27

run codes, check timing, test coil, check o2 sensors. I had the same problem. turned out to be timing being off. sometimes a bad coil can do that. once it heat's up, the circuit opens.... low rpms arent needing as much spark. high rpms, youll see-- try it out

yup ended up being the coil. I replaced the intire intake set-up and installed a hole new ignition system. But still have a very slight miss...can't figure it out to save my life.

October 24th, 2011, 01:29 PM	#1
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	My5.0 is Sluggish and popping in low rpms ? I have a 306 heads and cam full bolt-ons and when I drive my car it's real sluggish and pops from the exhaust then when I get past 4 grand it's perfect so what can I do to fix this problem would a tune do it ?

October 24th, 2011, 05:40 PM	#2
428CJ Regular Join Date: Oct 2010 Location: Boise, Id Posts: 142 iTrader: 0 reviews	My car does the same thing, Check your fuel pressure. __________________ 1988 Mustang: 5 speed, hurst shifter, plenty slow.

October 24th, 2011, 07:54 PM	#4
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	check your codes and fuel pressure. your fuel pressure should be around 39 psi with the vacuum line disconected from the fuel pressure reg. __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

October 25th, 2011, 08:53 AM	#6
mayosailor27 Better than Drugs! 97 Cobra makin' women wet Decent @ A fast one Join Date: Feb 2011 Location: Norfolk, VA now Posts: 1,587 iTrader: 0 reviews	run codes, check timing, test coil, check o2 sensors. I had the same problem. turned out to be timing being off. sometimes a bad coil can do that. once it heat's up, the circuit opens.... low rpms arent needing as much spark. high rpms, youll see-- try it out __________________ 96 GT-sold 98 GT-05 katrina victim-parted 90 GT-traded 98 GT-traded 98 GT-parted 94 GT/Cobra-sold 95 Cobra Saleened-sold 97 Cobra-knock -sold 99 GT-knock-sold 97 Cobra-sold 96 Cobra-nothing wrong but stock! MM Cobra member 969

October 25th, 2011, 05:24 PM	#8
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	It's possible that your balancer has spun And your timing is not reading correct. What codes showed up. Did you check yet? __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

October 24th, 2011, 06:12 PM	#3
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	I raised my fpr to 45psi

October 25th, 2011, 08:25 AM	#5
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	I did that and it's at 39 psi would me not having a better fuel pump cause this cause I still have the stock one n

October 25th, 2011, 01:49 PM	#7
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	And my timing is set to stock would that change anything if a heads and cam car timing is stock

October 25th, 2011, 05:41 PM	#9
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	No code is showing I have a 87 and no engine light is on or anything

October 25th, 2011, 07:28 PM	#10
steveofire Regular 1994 Mustang Cobra Join Date: Mar 2011 Location: Minnesota Posts: 185 iTrader: 0 reviews	just a thought but have you cleaned the maf lately I fixed a lot of cars that had a dirty maf on it one was a van that wouldn't rev past 3k it would just pop and no power I cleaned it and ran like a brand new van and it didn't throw a code

October 25th, 2011, 08:27 PM	#11
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	^ good point, id try that, but i would have thought a code would have shown up for that __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

October 25th, 2011, 10:24 PM	#12
steveofire Regular 1994 Mustang Cobra Join Date: Mar 2011 Location: Minnesota Posts: 185 iTrader: 0 reviews	I here ya my 94 did kind of the same thing with a turbo setup but it started to run on the rich side and was doing some of the same things never got a code and I finally tracked it down to one side was nice and clean and the other was coated with dirt lol

October 26th, 2011, 11:30 AM	#14
cornellm5 Regular Join Date: Apr 2009 Posts: 137 iTrader: 0 reviews	I'm gonna change out my 02 sensor as well cause when I first put the motor in with the cam I have it was dumping alot of fuel and kept fouling out the spark plugs I went thru two sets so I didn't the maf conversion so I'm guessing all that fuel that was coming out of my pipe could have messed up my 02 sensors

October 26th, 2011, 01:42 PM	#16
primetizzle Newbie 1995 Mustang GT Join Date: Apr 2010 Location: Bakersfield, CA Posts: 15 iTrader: 0 reviews	Okay wow I have the same exact problem...same engine also, 306 with just about every bolt on. When my car is cold it runs like shit- pops, stutters, back fires...but once my check engine light kicks on it runs like a champ...more then one person suggested cleaning the MAF, I decided to just replace it with the BBK 76mm CAI calibrated MAF...still same issues tho :/ what do you guys think?

October 26th, 2011, 07:58 PM	#18
ryanw I Post Entirely Way Too Much 1991 Ford Mustang GT Join Date: May 2007 Location: San Diego, California Posts: 6,063 iTrader: 0 reviews	If the o2 sensors were making your car run lean or rich, a code should be showing. Make sure that your check engine light is not burnt out, cuz you should have some codes, even if code 11 pops up wich means all system pass __________________ DART 331ci stroker, AFR 185 heads, Trick Flow R intake, Accufab 70mm tb, 75mm pro m Maf, 30lb injectors, jba headers, 2 1/2" x pipe flowmaster super 10 mufflers, 255 fuel pump, 3:27 gears

October 28th, 2011, 12:18 PM	#19
steveofire Regular 1994 Mustang Cobra Join Date: Mar 2011 Location: Minnesota Posts: 185 iTrader: 0 reviews	a couple other things you could check is check the tps make sure it has a nice sweep on a volt meter and u can check the voltage on the maf to make sure it has a clean sweep also and if you have a fuel pressure gauge hook it up and try to put it so you can see it or just take the hood off and mount it and go out and get on it under a load and make sure your fuel pressure isn't dropping off under the high loads

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