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07-28-2011, 10:21 PM
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#1 |
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Registered User
Join Date: Jun 2010
Location: windsor
Posts: 290
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4.3L hesitating when "cold"
Ill get right into it, when i start my truck up for the first time after i let it cool down completly (overnight or 8 hour shift at work) it seems to hesitate on takeoff and during any acceleration. It is getting pretty bad and i want this fixed soon since it is my DD and my only vehicle. what could cause this ?
P.S. It is a 1987 with tbi and a 4 speed stick. |
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07-29-2011, 08:48 AM
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#2 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,313
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Re: 4.3L hesitating when "cold"
anyone?
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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07-29-2011, 12:27 PM
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#3 |
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Registered User
Join Date: Jun 2009
Location: Columbus IN
Posts: 91
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Re: 4.3L hesitating when "cold"
Check base timing first. make sure it is at zero with the plug unplugged (under the booster)
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07-29-2011, 10:04 PM
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#4 |
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Registered User
Join Date: Jun 2010
Location: windsor
Posts: 290
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Re: 4.3L hesitating when "cold"
I timed it before I put it on the road a few weeks ago and I just checked the timing again, it is at zero when the plug is undone. Could it be an old cap, rotor, plugs and wires ? They are about 1.5 years old but the truck was sitting for a bit. How often do you replace them ?
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07-30-2011, 02:20 AM
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#5 |
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Registered User
Join Date: Nov 2006
Location: Amador County, Ca.
Posts: 229
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Re: 4.3L hesitating when "cold"
After the truck is warm does it run fine???? I have an '87 with a 350 that does the same thing when cold, but when it warms up its fine. I figure its a sensor that is not telling the motor its "cold".
__________________
1995 GMC 4x4 1/2 ton 1999 Jeep Wrangler w/ 33's 68 camaro 350/350 1987 Chevy 3/4 ton 4x4 Suzuki DRZ 400s Dual Sport 1971 chevy long bed 2x4 194? Dodge 2.5 ton 1980 Chevy Cheyenne 4x4 1/2 ton I6/sm455 1989 Chevy V30 crewcab dually 454/TH400 |
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08-01-2011, 11:44 PM
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#6 |
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Registered User
Join Date: Jun 2010
Location: windsor
Posts: 290
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Re: 4.3L hesitating when "cold"
Yea, its runs great after it gets to running temp. What sensor could that be ? I already replaced the water temp sender in the manifold.
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08-02-2011, 12:21 AM
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#7 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: 4.3L hesitating when "cold"
Remove and clean the EGR and air idle valves. The O2 sensor could be failing. Have you tried to pully any codes?
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08-02-2011, 09:51 AM
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#8 |
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Registered User
Join Date: Apr 2010
Location: Asheville, NC
Posts: 36
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Re: 4.3L hesitating when "cold"
I have the same problem in mine, It Is really annoying, hope you get it worked out so I can to lol
Posted via Mobile Device |
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08-02-2011, 06:16 PM
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#9 |
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Registered User
Join Date: Jun 2010
Location: windsor
Posts: 290
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Re: 4.3L hesitating when "cold"
how do I clean the EGR ? and what are the air idle valves ? There is a new 02 sensor in it.
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08-02-2011, 06:28 PM
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#10 |
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Overdrive club
Join Date: Sep 2007
Location: apache junction, arizona
Posts: 819
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Re: 4.3L hesitating when "cold"
Could be a weak fuel pump!Happened to me before!
__________________
1971 c-10 1951 3100 chevy 1970 chevy c-30 Sold! |
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08-02-2011, 10:06 PM
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#11 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: 4.3L hesitating when "cold"
Remove the EGR valve. Using compressed air, blow out all the black carbon. Use a solvent cleaner and small brush for large carbon deposits. Check for operation. The air idle valve is on the throttle body. It is held by two small screws. Remove it and clean the rubber end. It may be distorted or ruptured. Check for operation. It will set itself after you start it up. There is a procedure to set it too. Check with www.autozone.com. The fix it your self area had factory directions, pictures and diagrams.
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