Humidity affect starting?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

GMCjunkie · 08-14-2002, 05:50 AM

Can a drastic change in Humidity, California to Georgia, affect my trucks starting ability?? If so what can I do about it?? Been having trouble starting my burb, and not just in the morning when its cold, I changed the plugs, cap & rotar and still no change, also has a slight miss, but not sure if theyre related. ANY suggestions will be appreciated.

Longhorn Man · 08-14-2002, 07:23 AM

normally it woul take more than just a higher humindity to have an effect...more like a wet environment, plus the usual curlprit is the cap and rotor, which you've already replaced.

Mike C · 08-14-2002, 08:55 AM

Hard starting or missing during high humidity is usually a sign that it's time to replace the supression plug wires. The more powerful the ignition, usually the bigger the problem. I like the Taylor Spiro-Pro pre-made wires with straight boots on the distributor and 90's on the plugs that route behind the block and up to the plugs. Just order a set for your truck from Summit or Jegs for about $40.

70c10 · 08-14-2002, 09:26 AM

mIGHT BE VAPOR LOCK?

my new 72 · 08-14-2002, 09:37 AM

It's the fuel mixture. The carb is run a little rich for the added humidity. Adjust it down a little, and It'll take care of the problem. The moisture in the air down here in the south makes for a nasty fuel mix. It wets the plugs with condensation keeping them from firing untill they get warm enough to evaporate the moisture in the cylinder. No big deal. Leaning out the mix will take care of it.

Beast388 · 08-14-2002, 09:54 AM

You might also check the timing. With the altitude change and the grade of gas change, it might be a little too advanced or retarded. Just a thought.

Bill72BB · 08-14-2002, 10:45 AM

Junkie just move back to the Left Coast .

Bill

6869704X4 · 08-14-2002, 11:07 AM

Was anything done to the truck while in Cali?

08-14-2002, 05:50 AM	#1
GMCjunkie Dude...I'm a CHICK Join Date: Jul 2000 Location: Lakeland Georgia Posts: 6,192	Humidity affect starting?? Can a drastic change in Humidity, California to Georgia, affect my trucks starting ability?? If so what can I do about it?? Been having trouble starting my burb, and not just in the morning when its cold, I changed the plugs, cap & rotar and still no change, also has a slight miss, but not sure if theyre related. ANY suggestions will be appreciated. __________________ ~~~~~~~~~~~~~* "The unexamined life is not worth living" -Socrates ~~~~~~~~~~~~~* '71 GMC Suburban 4x4

08-14-2002, 08:55 AM	#3
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,739	Hard starting or missing during high humidity is usually a sign that it's time to replace the supression plug wires. The more powerful the ignition, usually the bigger the problem. I like the Taylor Spiro-Pro pre-made wires with straight boots on the distributor and 90's on the plugs that route behind the block and up to the plugs. Just order a set for your truck from Summit or Jegs for about $40. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

08-14-2002, 09:26 AM	#4
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	mIGHT BE VAPOR LOCK? __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

08-14-2002, 09:37 AM	#5
my new 72 faster, faster, faster Join Date: Dec 2001 Location: Houston ,Texas ,USA Posts: 1,354	It's the fuel mixture. The carb is run a little rich for the added humidity. Adjust it down a little, and It'll take care of the problem. The moisture in the air down here in the south makes for a nasty fuel mix. It wets the plugs with condensation keeping them from firing untill they get warm enough to evaporate the moisture in the cylinder. No big deal. Leaning out the mix will take care of it. __________________ I'm going to Law School, wanna debate? It's good practice.

08-14-2002, 09:54 AM	#6
Beast388 Suburbans RULE! Join Date: Jan 2000 Location: Clinton, IA 52732 Posts: 689	You might also check the timing. With the altitude change and the grade of gas change, it might be a little too advanced or retarded. Just a thought. __________________ --Ben 71 GMC Suburban 4X4 The "Beast" 388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's.

08-14-2002, 07:23 AM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	normally it woul take more than just a higher humindity to have an effect...more like a wet environment, plus the usual curlprit is the cap and rotor, which you've already replaced.

08-14-2002, 10:45 AM	#7
Bill72BB Thats the Hillbilly way Join Date: Jul 2001 Location: Torrance,Ca Posts: 5,979	Junkie just move back to the Left Coast . Bill __________________ BILL Torrance Calif 90504 Member DUF Club Member Old Farts Club 72 3/4ton Custom Camper BB402/400 trans Dynomax Cerama-coat headers , Hei distributor ,Edelbrock 1411 air,ps,pb,leafsprings ,98 chevy 60/40 seat,S10 shoulder belts tilt,3.54 Dana 60 rear. 16" Eagle wheels with LT265/75 16 tires,Gaylord Lid,H4 headlights with 100W relay conversion. " If I knew I was going to live this long I would have taken better care of myself " Marriage changes passion...suddenly you're in bed with a relative. A GUY'S PRAYER.... Lord, I pray for a nympho with huge boobs who owns a liquor store and likes to fish and hunt and has a Harley .Amen ,

08-14-2002, 11:07 AM	#8
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	Was anything done to the truck while in Cali? __________________ The more I learn about women, the more I love my truck.



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