RE: Idle problems

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RE: Idle problems

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RE: Idle problems - 9/4/2007 7:44:52 PM

lbelew

Posts: 54
Joined: 7/10/2007
Status: offline

I've varied my timing from the recommended 6 btdc to 12 btdc. It runs smoother the further I advance it but the best running timming makes her ping. Reading the service manual they say I should have 34-39psi fuel pressure, I've only got 28 with vacuum. What kind of reading do you have on yours without vacuum. Also wondering if my cat is creating a backpressure issue. Thanks.

(in reply to rshiver)

Post #: 61

RE: Idle problems - 9/4/2007 7:55:09 PM

rshiver

Posts: 381
Joined: 8/4/2007
Status: offline

I have about 37 psi with the vac unplugged. Listen to your exhaust, is it making a hissing sound if so I would suspect a clogged cat. Have you tried un plugging your sparkplug wires one at a time to see if you have a cylinder misfiring? Have you done a compression test on all eight cylinders?

_____________________________

"Giving up" is never an option.
..............(o o)
~~~o00o~(_)~o00o~~~

2000 Limited Edition Ford F-350 Lariat 4x4 Dually, 7.3 Liter Powerstroke Diesel
1985 L98 Corvette
1978 Chevy Camaro LT

(in reply to lbelew)

Post #: 62

RE: Idle problems - 9/4/2007 8:02:56 PM

cwb

Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline

Another pressure reference in the article, page 6, 3rd column, near the bottom:

below 35 psi, you get poor air/fuel mix, and idle and driveability problems. Is this the problem???

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Don''t know nuthin''; ain''t never got paid for wrenchin''...
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(in reply to rshiver)

Post #: 63

RE: Idle problems - 9/5/2007 3:17:00 PM

elwood

Posts: 4
Joined: 8/4/2007
Status: offline

1990 with same problems should I try the same fixes or is the cars different? Can only get about 12 degrees advance before engine stumbles badly?

(in reply to lbelew)

Post #: 64

RE: Idle problems - 9/5/2007 4:40:20 PM

rshiver

Posts: 381
Joined: 8/4/2007
Status: offline

On L98 engines the timing should be set at 6 degrees BTDC with the timing set connector unplugged. The timing set connector is located beside the distributor on the passengers side, it's a single, (brown and black I think) wire coming out of a wiring harness. Be sure to reconnect it after the timing is set.

_____________________________

"Giving up" is never an option.
..............(o o)
~~~o00o~(_)~o00o~~~

2000 Limited Edition Ford F-350 Lariat 4x4 Dually, 7.3 Liter Powerstroke Diesel
1985 L98 Corvette
1978 Chevy Camaro LT

(in reply to elwood)

Post #: 65

RE: Idle problems - 9/6/2007 5:45:42 PM

lbelew

Posts: 54
Joined: 7/10/2007
Status: offline

Well guys, the saga comes to an end. Found the consolidated ground on the drivers side head had a nut that was close to vibrating off, tough to see, but still visible. Appreciate all of the good advice and a special thanks to rshiver.

(in reply to rshiver)

Post #: 66

RE: Idle problems - 9/6/2007 6:03:36 PM

rshiver

Posts: 381
Joined: 8/4/2007
Status: offline

Congratulations man, glad you finally got it, now go and enjoy your Vette.

Cheers

_____________________________

"Giving up" is never an option.
..............(o o)
~~~o00o~(_)~o00o~~~

2000 Limited Edition Ford F-350 Lariat 4x4 Dually, 7.3 Liter Powerstroke Diesel
1985 L98 Corvette
1978 Chevy Camaro LT

(in reply to lbelew)

Post #: 67

RE: Idle problems - 9/6/2007 9:59:46 PM

cwb

Posts: 1508
Joined: 5/13/2007
From: eastern NC
Status: offline

quote:

ORIGINAL: rshiver

Congratulations man, glad you finally got it, now go and enjoy your Vette.

Cheers

I told you !!! Wouldn't listen to me tho', huh?

Noooooooooooooo...

Vacuum leak, huh?

Where did you get that idea anyway? Comic book? Horoscope? Psychic hotline???

_____________________________

Don''t know nuthin''; ain''t never got paid for wrenchin''...
[image]
http://www.stripers247.com/phpBB2/images/smilies/th_icon_stooges.gif[/image]

(in reply to rshiver)

Post #: 68

RE: Idle problems - 9/6/2007 10:29:36 PM

84corvetteC4

Posts: 173
Joined: 8/5/2007
Status: offline

....THANK GOD THATS OVER WITH

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1984 corvette ls1, 650 holley(high rise), custom intake, cam, full exhaust, 373's, bug catcher, 425rwhp/ 498ft/lbs is finally achieved Thank God!!!(new intake need to re-dyno;)

(in reply to cwb)

Post #: 69

RE: Idle problems - 9/7/2007 5:42:14 AM

rshiver

Posts: 381
Joined: 8/4/2007
Status: offline

quote:

I told you !!! Wouldn't listen to me tho', huh? Noooooooooooooo... Vacuum leak, huh? Where did you get that idea anyway? Comic book? Horoscope? Psychic hotline???

_____________________________

"Giving up" is never an option.
..............(o o)
~~~o00o~(_)~o00o~~~

2000 Limited Edition Ford F-350 Lariat 4x4 Dually, 7.3 Liter Powerstroke Diesel
1985 L98 Corvette
1978 Chevy Camaro LT

(in reply to cwb)

Post #: 70