Mustang runs Bad in Rain, Anyone else?

jpumpkinn · 02-21-2003, 12:23 AM

Hello,

For some reason when it rains alot and I drive around in my 90 gt runs very poorly. It idles very shaky and seems like it wants to turn off or will not stay on unless I give it alot of gas. Its so bad that I don't drive it when it rains. This is a big pain considering its my daily driver. Could my fender well mounted K&N be getting wet and causing this? Does this happen to anyone else? How can I fix this.

Thanks

jruppert · 02-21-2003, 01:27 AM

I know what you mean. Its hard to drive my mustang in the rain also. Whenever I get right into it my back tires seem to spin a lot.

No seriously, If your having trouble in the rain I would first replace the cap and rotor. After that I would check your plug wires. More then likely its a problem with wiring of some sort. If you replaced that and still having trouble, check your ignition. If not that then start checking your wiring harnesses going to sensors. But the plug wires, cap and rotor would be my first.

Maroon 5.0 LX · 02-21-2003, 08:17 AM

As jruppert said, check the cap and wires. The cap will get light film of dirt, and this seems to collect moisture, causing arcing, thus a misfire.

When plug wires get some age on them, the insulation absorbs moisture, again causing a misfire.

Dirt on the porcelain of the plugs get dirty and allows an arc, thus a misfire, especially when wet weather occurs.

jpumpkinn · 02-21-2003, 07:38 PM

I am not experiencing any misfiring. The problem is more of a stalling out problem. Trying to keep the car on is difficult and a big loss in power. Could the moist weathercap and wires cause this also. The ignition coil is new so I don't think that could be the problem.

Coupe50h · 02-21-2003, 07:43 PM

Yea, lotta rain in s.a lol, my car has the fender mount filter too, im thinking the same, the power loss could be coming from the humid air? notice dry cool air always makes your car feel snappy

other than that i dont know, i do try and avoid huge puddles since i dont want to intake water, that would make it stall im sure, also very bad for internals

BLACK85GT · 02-21-2003, 10:43 PM

I agree that it sounds electrical. could even have a cracked plug. just do a tune up, plugs, wires, cap, rotor, and take it from there.

sn95gt19 · 02-22-2003, 04:47 PM

had the same thing happen on 2 of my stangs and 4 of my buddies. all of them ended up being bad mass air sensors. they had a little bit different symptoms between them but for the most part they were the same

02-21-2003, 12:23 AM	#1
jpumpkinn Registered Member Join Date: Jun 2001 Location: san antonio Texas usa Posts: 127	Mustang runs Bad in Rain, Anyone else? Hello, For some reason when it rains alot and I drive around in my 90 gt runs very poorly. It idles very shaky and seems like it wants to turn off or will not stay on unless I give it alot of gas. Its so bad that I don't drive it when it rains. This is a big pain considering its my daily driver. Could my fender well mounted K&N be getting wet and causing this? Does this happen to anyone else? How can I fix this. Thanks __________________ Keep On Truckin!!

02-21-2003, 01:27 AM	#2
jruppert Registered Member Join Date: Jul 2001 Location: Reed City Mi Posts: 106	I know what you mean. Its hard to drive my mustang in the rain also. Whenever I get right into it my back tires seem to spin a lot. No seriously, If your having trouble in the rain I would first replace the cap and rotor. After that I would check your plug wires. More then likely its a problem with wiring of some sort. If you replaced that and still having trouble, check your ignition. If not that then start checking your wiring harnesses going to sensors. But the plug wires, cap and rotor would be my first. __________________ '94 GT, 347 stroker, AFR 185's, Trick Flow stage 2 Cam, Edelbrock upper and lower, 70mm Tbody, 77mm MAF, 24lb injectors, 255 lph pump, underdrive pulleys, 1 5/8 Motorsport Headers, king cobra clutch, tremec tko, 3.73 gears, flowmasters

02-21-2003, 08:17 AM	#3
Maroon 5.0 LX Registered Member Join Date: Mar 2001 Location: Southern Maryland Posts: 471	As jruppert said, check the cap and wires. The cap will get light film of dirt, and this seems to collect moisture, causing arcing, thus a misfire. When plug wires get some age on them, the insulation absorbs moisture, again causing a misfire. Dirt on the porcelain of the plugs get dirty and allows an arc, thus a misfire, especially when wet weather occurs. __________________ '89 LX 5.0 - 5 speed. Original Owner '94 E-150 4.9 Hi-Top Conversion Van '06 Mustang V-6, 5 speed

02-21-2003, 07:38 PM	#4
jpumpkinn Registered Member Join Date: Jun 2001 Location: san antonio Texas usa Posts: 127	I am not experiencing any misfiring. The problem is more of a stalling out problem. Trying to keep the car on is difficult and a big loss in power. Could the moist weathercap and wires cause this also. The ignition coil is new so I don't think that could be the problem. __________________ Keep On Truckin!!

02-21-2003, 07:43 PM	#5
Coupe50h Registered Member Join Date: Aug 2002 Location: SanAntonio, Tx Posts: 957	Yea, lotta rain in s.a lol, my car has the fender mount filter too, im thinking the same, the power loss could be coming from the humid air? notice dry cool air always makes your car feel snappy other than that i dont know, i do try and avoid huge puddles since i dont want to intake water, that would make it stall im sure, also very bad for internals __________________ 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

02-21-2003, 10:43 PM	#6
BLACK85GT Registered Member Join Date: May 2002 Location: Tampa,FLORIDA Posts: 340	I agree that it sounds electrical. could even have a cracked plug. just do a tune up, plugs, wires, cap, rotor, and take it from there. __________________ 5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear. Production # 9,377

02-22-2003, 04:47 PM	#7
sn95gt19 motors done......woohooo Join Date: Mar 2002 Posts: 799	had the same thing happen on 2 of my stangs and 4 of my buddies. all of them ended up being bad mass air sensors. they had a little bit different symptoms between them but for the most part they were the same __________________ 95gt lazer red (98 cobra clone) Rice Haters Club Member #116

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