Hesitation and slight popping during acceleration? Why?

jimdrechsler · 05-30-2005, 08:58 PM

need more fuel is my guess. running lean? mine was doing that same popping and didnt find out until i hooked up similar to a dyno tune with things in my exhaust reading the air/fuel mixture. my fuel pressure gauge under my hood was broken and i didnt know it. adjusted the fuel pressure (along with burning a chip!) and runs much better. dropped more than .2 off ym 1/4 mile times!

GhettoPop · 06-01-2005, 08:41 AM

i have the same problem. when the car is cold and I put the engine under load, it will hesitate and the exhaust will pop. a second or two later the engine will respond normally. it happens in 1st, 2nd, and 3rd gear. it starts up fine, every once in a while it will want to stall out right after i start it. if i give it a little gas or start it again after it stalls once, it will idle fine. idle is good when cold and warm. once i drive for 5 min and car warms a little, no more problems. injectors, TPS, TB, etc are all stock with 130,000+ miles. the timing is at 14 and i run 87 octine gas as i get no pinging and i have been running good at that timing before this problem started. i dont think i have any vacuum leaks but will check with a gauge at the tree. i will also check the tps voltage and i already have a new pcv valve and screen to pop in. will post my results...........

how can i checl fuell pressure? is there any gain to buying an adjustable fuel regulator and adjusting fuel pressure on a stock engine?

05-30-2005, 08:58 PM	#1
jimdrechsler Registered Member Join Date: Apr 2001 Posts: 167	Re: Hesitation and slight popping during acceleration? Why? need more fuel is my guess. running lean? mine was doing that same popping and didnt find out until i hooked up similar to a dyno tune with things in my exhaust reading the air/fuel mixture. my fuel pressure gauge under my hood was broken and i didnt know it. adjusted the fuel pressure (along with burning a chip!) and runs much better. dropped more than .2 off ym 1/4 mile times! __________________ OLD CAR-89 lx convt- Flowtech II headers, H-pipe, 2 1/2 "flowmasters- pulleys- 3.73's, ripper shifter- ram air- Best 1/4 mile time- a measley 14.2 at 98.6 PRESENT CAR- 90 LX BBK long tubes, h-pipe with cats, flowmasters. 3.55's holley systemax II kit- 70 mm TB 30#injectors, jacobs ignition, black magic fan, 180 thermostat, 75 shot of NOS- NITTO DR'S STREET TIRE BEST RUNS 1/4 mile13.2 @112 w/ NOS 2.17 60' 13.5 @103 2.1 60' *new time with Dr's 12.8 at 111 w/ 75 shot

06-01-2005, 08:41 AM	#2
GhettoPop Gimme a Drink! Join Date: Dec 2002 Location: NYC Posts: 694	Re: Hesitation and slight popping during acceleration? Why? i have the same problem. when the car is cold and I put the engine under load, it will hesitate and the exhaust will pop. a second or two later the engine will respond normally. it happens in 1st, 2nd, and 3rd gear. it starts up fine, every once in a while it will want to stall out right after i start it. if i give it a little gas or start it again after it stalls once, it will idle fine. idle is good when cold and warm. once i drive for 5 min and car warms a little, no more problems. injectors, TPS, TB, etc are all stock with 130,000+ miles. the timing is at 14 and i run 87 octine gas as i get no pinging and i have been running good at that timing before this problem started. i dont think i have any vacuum leaks but will check with a gauge at the tree. i will also check the tps voltage and i already have a new pcv valve and screen to pop in. will post my results........... how can i checl fuell pressure? is there any gain to buying an adjustable fuel regulator and adjusting fuel pressure on a stock engine? __________________ 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!

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