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98 Chevy 350 cam timing

This is a discussion on 98 Chevy 350 cam timing within the Technical / Maintenance forums, part of the General Discussion category; so im trying to find for a friend cam timing on a 98 chevy 350? also was wondering if it ...

  1. #1
    Registered User chevyking4's Avatar
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    98 Chevy 350 cam timing


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    so im trying to find for a friend cam timing on a 98 chevy 350? also was wondering if it is the same as a 4.3 as close to 0 retard or advanced?

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    Re: 98 Chevy 350 cam timing

    For a 98, the timing specification is called the cam retard offset and that value should be +/- 2 degrees of 0 at 1000 RPM.
    Last edited by 98GreenMachine; 11-03-2008 at 10:12 AM.
    08 HHR LS - 2.2 | 5 speed | 30 MPG

    98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

    84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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    Registered User chevyking4's Avatar
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    Re: 98 Chevy 350 cam timing

    hey thanks was that at 1000rpm's or 2000? the email i got when u replied said 2000rpms then when i looked at it on the forum it said 1000rpm's very weird never seen that happen

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    Re: 98 Chevy 350 cam timing

    sorry, I changed it. The RPM's need to be at least 1,000 for a accurate reading and adjustment.
    08 HHR LS - 2.2 | 5 speed | 30 MPG

    98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

    84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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    Registered User chevyking4's Avatar
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    Re: 98 Chevy 350 cam timing

    ok just wanted to make sure but thanks a million!

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    Re: 98 Chevy 350 cam timing

    Do you have a Tech2 scanner that will read the value?
    08 HHR LS - 2.2 | 5 speed | 30 MPG

    98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

    84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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    Registered User chevyking4's Avatar
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    Re: 98 Chevy 350 cam timing

    no i dont have one i just used the snap-on scanner at my old job whenever i need it lol but im going to check his timing with it to make sure thats what is wrong, before we take it to gm and pay 45 and they tell us that wasnt the prob and we dont get the money back

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    0_o o_0 0_o o_0 98GreenMachine's Avatar
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    Re: 98 Chevy 350 cam timing

    cool deal, just making sure you realized you needed a scanner to adjust the timing, not a timing light
    08 HHR LS - 2.2 | 5 speed | 30 MPG

    98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

    84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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    Registered User chevyking4's Avatar
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    Re: 98 Chevy 350 cam timing

    yea i knew but thanks for making sure lol also i know that the 02 4.3 is the same, but im really not sure at what rpm to check do you happen to? if not thats cool

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    Re: 98 Chevy 350 cam timing

    You can do the actual measurement at IDLE. Throw everything you ever thought you knew about timing a distributer out the window. It doesnt apply here.

    You just need to REV the engine over 1000rpm to reset the scan tool after EACH adjustment of the distributer.

    1)So you see what your scan tools reads for CMP retard.
    2)MAke an djustment via clocking the distributer
    3)Then REV teh engien over 1000 rpm with a quick jab of teh pedal or the t-body throttle arm, let engine idle again.

    read scan tool to see if CMP retard is within + or - 2.
    If its not, adjust, rev, read, adjust rev read.

    Basically revving the engine over 1000 rpm after EACH adjustment clears the previous reading.

    No need to hold an rpm, Thats old school distributer stuff.

    peace
    PAuly
    97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

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    Re: 98 Chevy 350 cam timing

    Quote Originally Posted by Pauly
    You can do the actual measurement at IDLE. Throw everything you ever thought you knew about timing a distributer out the window. It doesnt apply here.

    You just need to REV the engine over 1000rpm to reset the scan tool after EACH adjustment of the distributer.

    1)So you see what your scan tools reads for CMP retard.
    2)MAke an djustment via clocking the distributer
    3)Then REV teh engien over 1000 rpm with a quick jab of teh pedal or the t-body throttle arm, let engine idle again.

    read scan tool to see if CMP retard is within + or - 2.
    If its not, adjust, rev, read, adjust rev read.

    Basically revving the engine over 1000 rpm after EACH adjustment clears the previous reading.

    No need to hold an rpm, Thats old school distributer stuff.

    peace
    PAuly
    I didnt realize that, the GM service manuals just say to raise engine speed to 1000 rpms and check:

    TEST PROCEDURE
    The ignition timing cannot be adjusted. The distributor may need adjusting to prevent crossfire. To insure proper alignment of the distributor, perform the following:

    1. With the ignition OFF, install a scan tool to the DLC.
    2. Start the engine and bring to normal operating temperature. IMPORTANT: Cam Retard Offset reading will not be accurate below 1000 RPM.
    3. Increase engine speed to 1000 RPM.
    4. Monitor the Cam Retard Offset.
    5. If the Cam Retard indicates a value of 0+/-2, the distributor is properly adjusted.
    6. If the Cam Retard does not indicate 0+/-2, the distributor must be adjusted.

    ADJUSTING PROCEDURE

    1. With the engine OFF, slightly loosen the distributor hold down bolt. IMPORTANT: Cam Retard Offset reading will not be accurate below 1000 RPM.
    2. Start the engine and raise engine speed to 1000 RPM.
    3. Using a scan tool monitor Cam Retard Offset.
    4. Rotate the distributor as follows:

    4.1. To compensate for a negative reading, rotate the distributor in the counterclockwise direction.
    4.2. To compensate for a positive reading, rotate the distributor in the clockwise direction.

    5. Repeat step 4 until 0+/-2, is obtained.
    6. Turn the ignition OFF.
    7. Tighten the distributor hold-down bolt to 3 Nm (25 lb. ft.).
    8. Start the engine, raise engine speed to 1000 RPM and recheck Camshaft Retard Offset.
    08 HHR LS - 2.2 | 5 speed | 30 MPG

    98 K1500 Z71 - 204k | L31 | 60E | 3.73's | 3" BL | 33x12.5x15 Dick Cepek F-C II's | Dynomax Ultra Flo X DI/DO | 14 MPG

    84 S15 Jimmy 2dr 4x4 - engine/tranny all rebuilt

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    Re: 98 Chevy 350 cam timing

    Cool man, I didnt realize that. I am only quoting my personal experience. I kept clocking the dizzy 1 day and the CMP retard wouldnt change. Then I started revving the engine after each adjustment and was able to get a perfect 0 CMP retard.

    Thanks for the GM info.

    peace
    PAuly
    97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

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    Registered User chevyking4's Avatar
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    Re: 98 Chevy 350 cam timing

    yea great info to have!

 

 

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