big hesitation when cold

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Sep 4, 2006 | 03:11 PM

lawnjockey

Thread Starter

Cruising

Joined: Aug 2006

Posts: 10

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big hesitation when cold

engine fires right up when cold, but when the throttle is blipped, there is a bad hesitation. After it warms up it seems to go away. no codes

Sep 4, 2006 | 03:17 PM

RRT vette

Le Mans Master

Joined: Feb 2006

Posts: 8,753

Likes: 9

From: Louisiana

Year of vette wasn't posted nor is it in your profile, but I see from a different thread that you have an 1986 vette. If you haven't...I would start with cleaning the IAC and throttle body. Also check the voltage at the TPS. With no codes to go by...you will be looking for things that won't set codes and the IAC and TB are two of them. If this doesn't help try some Seafoam. Other will suggest also.

Sep 5, 2006 | 12:24 AM

lawnjockey

Thread Starter

Cruising

Joined: Aug 2006

Posts: 10

Likes: 0

sorry it is an 86L with a compu cam 2040, adj regulator, and ported heads, etc.

Sep 5, 2006 | 03:36 AM

James Paradiso

Instructor

Joined: Jul 2006

Posts: 138

Likes: 0

From: Eagle River Alaska

I'm having the same prob with my 86. Fully stock except for a adjustible FPR, K&N, 160 stat. Starts right up when cold but if I try to rev it a little then it will hesitate or choke itself. I usually let it idle for about 3 minutes and this goes away. I replaced my IAC and checked my TPI voltage. Still no luck....

Sep 5, 2006 | 04:12 PM

lawnjockey

Thread Starter

Cruising

Joined: Aug 2006

Posts: 10

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any more ideas

Sep 5, 2006 | 05:34 PM

teebee

Safety Car

Joined: Aug 2004

Posts: 4,905

Likes: 729

From: Southwest Kansas

2022 Corvette of the Year Finalist -- Unmodified

2021 C6 of the Year Winner - Unmodified

My 94 LT1 is the same way.

Sep 5, 2006 | 08:13 PM

lawnjockey

Thread Starter

Cruising

Joined: Aug 2006

Posts: 10

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i set the idle speed and tps voltage as the tech tips section said and I still have this problem

Sep 6, 2006 | 12:34 AM

black_89_vette

Melting Slicks

Joined: Nov 2000

Posts: 2,469

Likes: 6

From: Winchester Ontario

Maybe it has do to with open loop / closed loop operation on the chip. Have you ever had your chip programmed or tinkered with?

If it happens when it's cold but goes away after 3 minutes or so that's what it sounds like to me. I bet it also happens when warm, just on a restart right?