73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: flips87c30 on April 12, 2013, 08:35:15 pm

Title: truck cough
Post by: flips87c30 on April 12, 2013, 08:35:15 pm

My truck has recently developed a cough/stutter it only seems to happen at mid throttle it wont happen once I am up to speed, or when I give it more to get up a hill. But going from a dead stop it coughs like crazy. It also runs just fine in park I can rev it up no problems. Im thinking I should start looking at the distributor cap and rotor. I just replaced them mabey I screwed something up? Any suggestions? Thanks in advance.

Title: Re: truck cough
Post by: Mule man on April 12, 2013, 10:09:39 pm

I'm almost sure that you have a vacuum leak.  Probably a cracked rubber line somewhere.

Title: Re: truck cough
Post by: flips87c30 on April 14, 2013, 12:22:04 pm

Been working on the truck all morning still cant figure this out. I cant find any leaking vacuum lines. It runs fine for a mile or two then starts acting up again.It was running fine, before I replaced the following, right side exhuast manifold, dist cap and rotor, map sensor, thermostat, and the preheater hose. this cough has me stumped its almost like a really quiet backfire. Could it be my pick up coil? At this point im just guessing.

Title: Re: truck cough
Post by: zieg85 on April 14, 2013, 01:22:03 pm

Could you have accidentally crack the ceramic on a spark plug or damage a spark plug wire?

Title: Re: truck cough
Post by: flips87c30 on April 14, 2013, 02:50:09 pm

yes. thanks zieg. I dont even know what to say for myself. 

Title: Re: truck cough
Post by: VileZambonie on April 14, 2013, 03:49:11 pm

Try Robitussin  ;D

So is it skipping or hesitating?

Title: Re: truck cough
Post by: zieg85 on April 14, 2013, 04:03:35 pm

My initial thought was "does anyone have a Ricola?"

Title: Re: truck cough
Post by: VileZambonie on April 14, 2013, 04:08:51 pm

RRRRIIIICOLAAA!!!!

Title: Re: truck cough
Post by: flips87c30 on April 14, 2013, 09:26:43 pm

Quote from: VileZambonie on April 14, 2013, 03:49:11 pm

Try Robitussin  ;D

So is it skipping or hesitating?

Obviously tried Robitussin first thing but it fouled my injectors, the vicks vapor rub on the air filter proved equally useless.  In all seriousness I guess Its skipping. But I think I found my problem when I looked closely at the plug wires. one was partially melted. time for a new set. any suggestions, What brand do you guys use?   

Title: Re: truck cough
Post by: Captkaos on April 15, 2013, 01:20:50 pm

I run off the shelf stuff for my driver..  Accel MSD or Taylor for my non-stock stuff.

Title: Re: truck cough
Post by: VileZambonie on April 16, 2013, 08:40:17 pm

Always run a good quality set of ignition cables don't get the cheap ones.