Cold backfire & No power

scottrob · 04-13-2006, 09:38 PM

I have a daily drive minor moded GT that's backfiring when you first accelerate with any power on a cold engine and was pinging. Now once it's warmed up, it surges during acceleration to a point and then just acts like a few cyclinders shut down and there's really no more power. It has a new Comp Cams timing chain in it, new cap and rotor and wires. I've adjust the timing and things get a little better or worse but still the same problem. The ignition module went bad last year so it's new and the coil was changed at the same time. Any ideas? This 5.0 is accelerating like a 1.0.

1989GT · 04-14-2006, 12:02 PM

I'd start by checking for vaccum leaks, check your TPS voltage and clean your MAF.

Coupe50h · 04-15-2006, 12:01 AM

clean the pin connectors, also check your headers for leaks around the gasket's.
my car will give a pop every now and then only when it's cold, but warms up fast and has plenty of power though, might check intake bolts make sure their tight.
seems egr's can surge idles as well.

scottrob · 04-15-2006, 08:26 PM

Problem solved. MAF sensor was bad. Thanks for all the help.

04-13-2006, 09:38 PM	#1
scottrob Registered Member Join Date: Apr 2006 Location: Kansas Posts: 3	Cold backfire & No power I have a daily drive minor moded GT that's backfiring when you first accelerate with any power on a cold engine and was pinging. Now once it's warmed up, it surges during acceleration to a point and then just acts like a few cyclinders shut down and there's really no more power. It has a new Comp Cams timing chain in it, new cap and rotor and wires. I've adjust the timing and things get a little better or worse but still the same problem. The ignition module went bad last year so it's new and the coil was changed at the same time. Any ideas? This 5.0 is accelerating like a 1.0.

04-14-2006, 12:02 PM	#2
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Re: Cold backfire & No power I'd start by checking for vaccum leaks, check your TPS voltage and clean your MAF. __________________ 89GT,Pro-Bullet 306, H/C/I and a bunch of other stuff. Sold 00GT, Vortech S-Trim, Steeda Boost Pipe, C&L intake, Mac off-road H-pipe, Flowmasters, B&M Ripper shifter, Eibach Sportline springs, Koni Struts/shocks, MM full length subframe connectors, Cobra brakes, 3.73's. My Car Domain Page

04-15-2006, 12:01 AM	#3
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Re: Cold backfire & No power clean the pin connectors, also check your headers for leaks around the gasket's. my car will give a pop every now and then only when it's cold, but warms up fast and has plenty of power though, might check intake bolts make sure their tight. seems egr's can surge idles as well. __________________ 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

04-15-2006, 08:26 PM	#4
scottrob Registered Member Join Date: Apr 2006 Location: Kansas Posts: 3	Re: Cold backfire & No power Problem solved. MAF sensor was bad. Thanks for all the help.

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