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Discussion Starter #1
I've have a problem and hope someone here can help, PLEASE!!! On my 1990 fleetwood I replaced the plugs and wires eversince i did this my car seems to studder in the mornings only when it is cold and since its getting really cold here in illinois its happenning more often.
I did pull up some codes from the warmer/off button and here they are:
E30
E52
E98
E99
and is this something i can fix?? also My climate control is off I had to replace my heater core because it was leaking but now i bearly have any heat if any!! and yesterday it started fluctuating means it would blow up and down. If anyone can help me figure this one out I would appreciate it cause 2 mechanics said there was nothing wrong but thats cause this studdering doesnt happen after the car is warm.
PLEASE HELP OR POINT ME IN A GOOD DIRECTION!!
 

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07 Black Raven CTS, 07 Gold Mist CTS
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453 Posts
Check this website for further info on ODB 1 codes and good luck!
http://myweb.accessus.net/~090/dtcobd1.html The Ranger is the expert on all things mechanical here....you can also run a search at the top of the forum with keywords to check prior posts. Try clearing the DTC's (diagnostic trouble codes) you pulled using the info furnished on the site above and check to see what returns. If any are current they could need attention. Also, a GM Service Manual set is a very good investment and others have related that early models' manuals are being discounted at Helm, Inc. Mine have repaid the investment over and over and over.
 

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White Diamond '03 DHS (with DTS floor shift)
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P030 (E030) ................................................... ISC RPM out of range. Adjust or replace the ISC motor

P052 (E052) ....................................................... PCM Memory Reset. Ignore it. Probably from pulling battery power.

P098 (E098) .................................... High RPM P/N to D/R Shift Under ISC. Most likely due to P030. Fix that one and you'll fix this one.

P099 (E099) ............................ Cruise Control Servo Applied, Not in Cruise. Sounds like the servo is getting vacuum when it is not supposed to.
 

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Discussion Starter #4
Ranger said:
P030 (E030) ................................................... ISC RPM out of range. Adjust or replace the ISC motor

P052 (E052) ....................................................... PCM Memory Reset. Ignore it. Probably from pulling battery power.

P098 (E098) .................................... High RPM P/N to D/R Shift Under ISC. Most likely due to P030. Fix that one and you'll fix this one.

P099 (E099) ............................ Cruise Control Servo Applied, Not in Cruise. Sounds like the servo is getting vacuum when it is not supposed to.

Thanks Ranger, Now is the ISC easy to fix or should it go to a mechanic?? and where should i look for the vacuum problem? or the general area i should be looking I have a Haynes manual but i guess its no good.

Thanks to all those who respond in advance.
 

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White Diamond '03 DHS (with DTS floor shift)
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86,792 Posts
I think with the engine running and cruise not set, there should be no vacuum to the diaphram. I'd start looking there and if there is, trace it back and see if you can figure out why there is.

The ISC motor is mounted on the side of the TB with a plunger on the throttle lever. One sign of it failing is ratcheting when you shut down. It is fairly easy to replace. There are a lot of threads on it. Some even have pictures if I recall. I think I recently posted a link to one with pictures.

Regarding the heat, what do you mean by "blowing up and down"?

What engine is in that car?
 

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Discussion Starter #6
what i mean by blowing up and down is its like some pressing the hi and lo on the climate control. and its a 4.9liter
 
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