4.3l v6 hesitation and bogging

[jamey777]

I've been battling a problem recently with my 4.3l vortec v6. I would hesitate while running kind of like a half second about every 10 seconds, take off was pitiful and as far a jumping into the passing gear to haul butt you could forget that. Well I broke down and took it to a mechanic shop yesterday which happens to be a long time friend of the family. There were several codes stored into the computer. But it ended up being the rotor, distributor cap, and the mass air flow sensor. It seems to be running good now. This is just a little heads up to all that are experiencing this same problem.

[sjspor]

You need more than a cap and rotor.. unless you like changing them..

 

Here's the bullitin. Bulliting #03-06-04-041 published on 08/26/2003.

 

-------------------------

Poor Engine Performance - Misfire, Rough Idle, Service Engine Soon/Check Engine Light Illuminated, DTC P0300 Set (Inspect DIstributor Ignition (DI) System Components and Replace As Necessary) #03-06-04-041 - (08/26/2003)

Poor Engine Performance -- Misfire, Rough Idle, Service Engine Soon/Check Engine Light Illuminated, DTC P0300 Set (Inspect Distributor Ignition (DI) System Components and Replace As Necessary)

2001-2003 Chevrolet Astro, Blazer, Express, S-10, Silverado

 

2001-2003 GMC Jimmy, Safari, Savana, Sierra, Sonoma

 

2001 Oldsmobile Bravada

 

with 4.3L, 5.0L or 5.7L Gas Engine (VINs W, X, M, R -- RPOs L35, LU3, L30, L31)

 

Condition

Some customers may comment on poor engine performance and the Service Engine Soon/Check Engine light being illuminated. Upon investigation, the technician may find DTC P0300 set.

 

Cause

This condition may be due to high levels of internal corrosion in the distributor, causing spark to go to the wrong cylinder. This corrosion is attributed to a lack of air flow internal to the cap caused by the EIP screens being clogged with debris.

 

Correction

Inspect the internal components of the Distributor Ignition System using the procedure listed below. A new distributor base has been released for service with improved airflow screens.

 

Inspect the distributor cap. You may notice a white residue on the cap walls. For higher mileage occurrences, the interior of the cap may have changed to medium brown in color.

Inspect the distributor rotor. You may notice the presence of black streaks on the plastic surface. More typical evidence would be visible green spots on the copper surface of the rotor segment.

Inspect the distributor base. You may notice high levels of surface rust on the distributor shaft or surface contamination on the sensor hold down screws.

Inspect the distributor EIP screen. The screens should be free of any debris and the mesh should be visibly porous.

All of these inspection can be done on-vehicle. If there is evidence of this internal corrosion, replace the affected component. Refer to the appropriate procedure in the Engine Controls sub-section of the applicable Service Manual.

 

In addition, it has been determined on the Sierra and Silverado applications with the 4.3L engine that the A/C accumulator line is routed directly above the distributor area and condensation from that line can aggravate the corrosion condition. For these vehicles, install the foam sleeve, P/N 15190971, to the A/C line. Cut a slit in the sleeve and secure to the line using tie-straps.

 

Parts Information

Part Number

Description

 

10452458

Cap, Distributor (V6)

 

10452457

Rotor, Distributor (V6 and V8)

 

93441559

Distributor (V6)

 

10452459

Cap, Distributor (V8)

 

93441558

Distributor (V8)

 

15190971

Foam Sleeve

[lab1508]

How do you set the timing on a 1999 GMC Jimmy 4.3L? What marks need to be in line?

Thanks

 

 

 

 

You need more than a cap and rotor.. unless you like changing them..

 

Here's the bullitin. Bulliting #03-06-04-041 published on 08/26/2003.

 

-------------------------

Poor Engine Performance - Misfire, Rough Idle, Service Engine Soon/Check Engine Light Illuminated, DTC P0300 Set (Inspect DIstributor Ignition (DI) System Components and Replace As Necessary) #03-06-04-041 - (08/26/2003)

Poor Engine Performance -- Misfire, Rough Idle, Service Engine Soon/Check Engine Light Illuminated, DTC P0300 Set (Inspect Distributor Ignition (DI) System Components and Replace As Necessary)

2001-2003 Chevrolet Astro, Blazer, Express, S-10, Silverado

 

2001-2003 GMC Jimmy, Safari, Savana, Sierra, Sonoma

 

2001 Oldsmobile Bravada

 

with 4.3L, 5.0L or 5.7L Gas Engine (VINs W, X, M, R -- RPOs L35, LU3, L30, L31)

 

Condition

Some customers may comment on poor engine performance and the Service Engine Soon/Check Engine light being illuminated. Upon investigation, the technician may find DTC P0300 set.

 

Cause

This condition may be due to high levels of internal corrosion in the distributor, causing spark to go to the wrong cylinder. This corrosion is attributed to a lack of air flow internal to the cap caused by the EIP screens being clogged with debris.

 

Correction

Inspect the internal components of the Distributor Ignition System using the procedure listed below. A new distributor base has been released for service with improved airflow screens.

 

Inspect the distributor cap. You may notice a white residue on the cap walls. For higher mileage occurrences, the interior of the cap may have changed to medium brown in color.

Inspect the distributor rotor. You may notice the presence of black streaks on the plastic surface. More typical evidence would be visible green spots on the copper surface of the rotor segment.

Inspect the distributor base. You may notice high levels of surface rust on the distributor shaft or surface contamination on the sensor hold down screws.

Inspect the distributor EIP screen. The screens should be free of any debris and the mesh should be visibly porous.

All of these inspection can be done on-vehicle. If there is evidence of this internal corrosion, replace the affected component. Refer to the appropriate procedure in the Engine Controls sub-section of the applicable Service Manual.

 

In addition, it has been determined on the Sierra and Silverado applications with the 4.3L engine that the A/C accumulator line is routed directly above the distributor area and condensation from that line can aggravate the corrosion condition. For these vehicles, install the foam sleeve, P/N 15190971, to the A/C line. Cut a slit in the sleeve and secure to the line using tie-straps.

 

Parts Information

Part Number

Description

 

10452458

Cap, Distributor (V6)

 

10452457

Rotor, Distributor (V6 and V8)

 

93441559

Distributor (V6)

 

10452459

Cap, Distributor (V8)

 

93441558

Distributor (V8)

 

15190971

Foam Sleeve