popping noise when cold under load

GhettoPop · 10-29-2004, 10:48 PM

when i start driving and car is very cold, i hear a popping sound along with hesitation. its mainly in 2nd or 3rd at with engine load. its fine for a second, you put the engine under load it pops, bangs, and hesitates, then after 3 seconds its fine. once the car starts warming up in 3-4 minutes, it goes away. whats the cause of this? i hope i described it well enough.

i attached two pics. i forget what these sensors are called and would guess they are original pieces. can they be the source of my problem and should i change them for the hell of it?

Coupe50h · 10-30-2004, 06:28 PM

Intake Gasket? Or Exhaust Header Gasket?

gshock420 · 11-06-2004, 02:10 PM

take a look at the spark plugs

fongo · 11-07-2004, 12:14 PM

Ghettopop! No problem. I had the same exact problem. People were telling me it was the timing, the 02 sensors, etc. Although these are possibilities, it turned out to be simpler than I thought. First, about the pics, for the 1st pic, the sensor underneath the upper intake is the ACT air temp sensor and for the 2nd pic its the ECT engine coolant sensor (next to the oil cap and distributor). I originally changed both of those suspecting that those were the problem. It turns out they weren;t.
All I did was pop the MAF mass air sensor, cleaned with intake;/carb cleaner gently thru the tiny thermocouple insisde, After soaking it, I let it dry and restored it ( I have a cold air induction MAC, so it was easy). I also put in a new PCV valve too. Boom!! the popping went away, no more backfiring, bad fuel mileage etc.
Try it! You'll be surprised, those little things fool you. I learned it after spending over $100 in new ACT and ECT sensors (alhtough they werent the problem, it was time to pop new ones anyway: I got 167K!). good luck!

GhettoPop · 11-08-2004, 09:19 AM

autolite plugs, FMS wires, MSD cap/rotor are all good, all bout 1 ry old. cleaned MAF, TB, and IAC this weekend. i got a new pcv valve and screen, how the hell do i reach the pcv valave? i cant really get back there and kinda unsure where it is. i know its on the back of the engine close to the firewall. help?

as for the Intake Gasket, this is between the upper and lower intake? well, this as well as the exhaust gaskets are probally original. (127k miles) my problem started occuring when the weather got colder, 30's at night. it simply hesitates at mostly low RPM's when cold. 5 minutes later car is perfect.

james87gt · 11-10-2004, 07:59 PM

sounds like your running too lean

fongo · 11-10-2004, 08:22 PM

you may run lean when your MAF, ACT, ECT & O2 sensors are bad. For instance, if they are dirty, coated, or old, the conductivity thru these sensors will decrease and give a misleading or faulty signal to the ECC. The ECC in return readjusts the air/fuel mixture ratio and tells the injectors and TB to deliver gas and air in undesirable ratios.
...bottom line is, with the electronics underneath the 5.0 hood, your best bet is to check the sensors or even scan the ECC and look for codes to see which sensors are bad....my 2 cents...good luck!

Coupe50h · 11-10-2004, 08:53 PM

Although my problem was the lower intake gaskets, or i thought, i noticed mine went away when i took off the 73mm c&l and put on a 75 pro-m, but im not sure, could be an egr problem?

GhettoPop · 11-12-2004, 10:11 AM

thanks for the replies. my o2 sensors are a yr or 2 old and should be good. my friend whos a mechanic just bought a $4000 scanner, will have to give him a call. its an amazing piece of equiptment. might just change ACT and ECT for the hell of it since they are probally original. ford parts or aftermarket will be good?

Unit 5302 · 11-12-2004, 11:01 PM

Sounds like a bad fuel injector to me. If it is, you'll likely experience the problem getting worse and starting to happen even when the engine is warm. By the way, a hard backfire is capable of destroying the catalytic converter, but I'm guessing what you have is a

"bunk ba bunk bunk" sound. Once the backfire is done, the car pulls hard?

GhettoPop · 11-15-2004, 01:36 PM

Quote:

Originally Posted by Unit 5302

Sounds like a bad fuel injector to me. If it is, you'll likely experience the problem getting worse and starting to happen even when the engine is warm. By the way, a hard backfire is capable of destroying the catalytic converter, but I'm guessing what you have is a

"bunk ba bunk bunk" sound. Once the backfire is done, the car pulls hard?

yes, pulls hard after. like i said, only occasional happens when car is very cold for a few minutes at low rpm's. dunno bout the fuel injector, i had this same problem last winter and it was gone in summer now has come back. its just a little annoying, i can live with it but wanna try to fix it. hesitation and popping sounds at low rpm's when cold, especially when you step on the gas. goes away in a few minutes. also, i dont have cats

Coupe50h · 11-15-2004, 02:42 PM

unit, now that i remember, my low rpm popping went away after i replaced my injectors, cuz i did that when i upgraded my maf.....so yea might try having them cleaned, or borrow someone elses to see if it changes.

Unit 5302 · 11-18-2004, 07:40 PM

The colder weather is probably partially to blame. Colder air means the car needs more fuel. If the injectors aren't flowing properly (clogged or broken) it is more likely to cause problems when it's colder.

cenok is family · 11-18-2004, 09:24 PM

sounds to me like the flux compasitor is running low...might wanna refill it with some banana peels and beer cans....

10-30-2004, 06:28 PM	#2
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: popping noise when cold under load Intake Gasket? Or Exhaust Header Gasket? __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-06-2004, 02:10 PM	#3
gshock420 Registered Member Join Date: Nov 2004 Location: New Jersy Posts: 7	Re: popping noise when cold under load take a look at the spark plugs

11-07-2004, 12:14 PM	#4
fongo Registered Member Join Date: Jan 1999 Location: Farmingdale, NY Posts: 139	Re: popping noise when cold under load Ghettopop! No problem. I had the same exact problem. People were telling me it was the timing, the 02 sensors, etc. Although these are possibilities, it turned out to be simpler than I thought. First, about the pics, for the 1st pic, the sensor underneath the upper intake is the ACT air temp sensor and for the 2nd pic its the ECT engine coolant sensor (next to the oil cap and distributor). I originally changed both of those suspecting that those were the problem. It turns out they weren;t. All I did was pop the MAF mass air sensor, cleaned with intake;/carb cleaner gently thru the tiny thermocouple insisde, After soaking it, I let it dry and restored it ( I have a cold air induction MAC, so it was easy). I also put in a new PCV valve too. Boom!! the popping went away, no more backfiring, bad fuel mileage etc. Try it! You'll be surprised, those little things fool you. I learned it after spending over $100 in new ACT and ECT sensors (alhtough they werent the problem, it was time to pop new ones anyway: I got 167K!). good luck! __________________ 1993 GT, MAC Fenderwell Cold Air Induction; Accel dist.,Splitfire plugs, BBK: 1 5/8 unequal length shorties, hi flow H-pipe w/ cats; Flowmasters 2 chamber American Thunder catback system, Motorsports 3-core radiator, 180º thermostat, BBK adj. clutch quad...the rest is bone stock!..but more mods to come!!

11-08-2004, 09:19 AM	#5
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Re: popping noise when cold under load autolite plugs, FMS wires, MSD cap/rotor are all good, all bout 1 ry old. cleaned MAF, TB, and IAC this weekend. i got a new pcv valve and screen, how the hell do i reach the pcv valave? i cant really get back there and kinda unsure where it is. i know its on the back of the engine close to the firewall. help? as for the Intake Gasket, this is between the upper and lower intake? well, this as well as the exhaust gaskets are probally original. (127k miles) my problem started occuring when the weather got colder, 30's at night. it simply hesitates at mostly low RPM's when cold. 5 minutes later car is perfect. __________________ 1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong!

11-10-2004, 07:59 PM	#6
james87gt Registered Member Join Date: Jan 2002 Posts: 62	Re: popping noise when cold under load sounds like your running too lean

11-10-2004, 08:22 PM	#7
fongo Registered Member Join Date: Jan 1999 Location: Farmingdale, NY Posts: 139	Re: popping noise when cold under load you may run lean when your MAF, ACT, ECT & O2 sensors are bad. For instance, if they are dirty, coated, or old, the conductivity thru these sensors will decrease and give a misleading or faulty signal to the ECC. The ECC in return readjusts the air/fuel mixture ratio and tells the injectors and TB to deliver gas and air in undesirable ratios. ...bottom line is, with the electronics underneath the 5.0 hood, your best bet is to check the sensors or even scan the ECC and look for codes to see which sensors are bad....my 2 cents...good luck! __________________ 1993 GT, MAC Fenderwell Cold Air Induction; Accel dist.,Splitfire plugs, BBK: 1 5/8 unequal length shorties, hi flow H-pipe w/ cats; Flowmasters 2 chamber American Thunder catback system, Motorsports 3-core radiator, 180º thermostat, BBK adj. clutch quad...the rest is bone stock!..but more mods to come!!

11-10-2004, 08:53 PM	#8
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: popping noise when cold under load Although my problem was the lower intake gaskets, or i thought, i noticed mine went away when i took off the 73mm c&l and put on a 75 pro-m, but im not sure, could be an egr problem? __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-12-2004, 10:11 AM	#9
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Re: popping noise when cold under load thanks for the replies. my o2 sensors are a yr or 2 old and should be good. my friend whos a mechanic just bought a $4000 scanner, will have to give him a call. its an amazing piece of equiptment. might just change ACT and ECT for the hell of it since they are probally original. ford parts or aftermarket will be good? __________________ 1990 GT,stock T-5,K&N w/o air silencer,March underdrives,FMS wires,timing@14*,PA Perf 130amp alt,Steeda Tri-Ax Shifter,Steeda adj quadrant/clutch cable/firewall adj,Centerforce II clutch,o/r x-pipe,Magnaflow SS catback,g-load brace, subframes,Bilstein struts/shocks,Autometer gauges, 136k and running strong!

11-12-2004, 11:01 PM	#10
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: popping noise when cold under load Sounds like a bad fuel injector to me. If it is, you'll likely experience the problem getting worse and starting to happen even when the engine is warm. By the way, a hard backfire is capable of destroying the catalytic converter, but I'm guessing what you have is a "bunk ba bunk bunk" sound. Once the backfire is done, the car pulls hard?

11-15-2004, 02:42 PM	#12
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: popping noise when cold under load unit, now that i remember, my low rpm popping went away after i replaced my injectors, cuz i did that when i upgraded my maf.....so yea might try having them cleaned, or borrow someone elses to see if it changes. __________________ X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's. race weight 3,160 12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear 13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear

11-18-2004, 07:40 PM	#13
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	Re: popping noise when cold under load The colder weather is probably partially to blame. Colder air means the car needs more fuel. If the injectors aren't flowing properly (clogged or broken) it is more likely to cause problems when it's colder.

11-18-2004, 09:24 PM	#14
cenok is family Registered Member Join Date: Nov 2004 Location: 4 oh ******* five, Oklahoma Posts: 32	Re: popping noise when cold under load sounds to me like the flux compasitor is running low...might wanna refill it with some banana peels and beer cans.... __________________ 87 GT 308 rebuilt by me, Ross forged pistons, cobra intake, thumpers with 1.94/1.6s, afm n-412 cam, 65mm tb, proflow 75mm maf, 3.5" power pipe, 24# inj, 255lph fp, 1.6 rr's, kirban afpr, u/d pullies, KC clutch, pro 5.0 shifter, 4.10's, hedman L/Ts, 2.5" H pipe, spintech prostreets, frpp alum d/s, MAC c/c plates, MSD 6al, 3G alt, f/l sfc, UPR uca's/lca's, tokico shocks/struts, maxspeed springs, HID 5000k My CarDomain

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