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Need help on 98 cad seville sls

04-17-2008, 03:18 PM
Hi thank you all in adavnce, I am working on a 1998 cadillac seville sls v8 4.6l vin "y"

Problems I ran into:

It has a loud whistling when u start the car up like its a vacum leak or intake manifold gasket leak when you goto rev it up, :banghead:the whistle stops till you get to a high idle then it starts to whistle again not sure what it is

I pulled these dio codes from it:
#1. P0201 #1 cylinder injector circut open
#2. P0155 02 heat circut bank 2 sensor 1
#3. P0204 #4 cylinder injector circut open
#4. P0206 #6 cylinder injector circut open
#5. P0207 #7 cylinder injector circut open
#6. P0201 #1 cylinder injector circut open
#7. P0204 #4 cylinder injector circut open
#8. P0206 #6 cylinder injector circut open
#9. P0207 #7 cylinder injector circut open

:screwy:The guy took it into a shop and had a new used pcm put in and they configured it to the car but did not pull the codes but did a 27 point dio on it and came back with 360 parts per million hc's in cooling system (raw fuel) and they recomend him have the cylinder head gaskets replaced but they DID NOT pull any codes off of the pcm and he wants to save money but we need to figure out how to fix the codes above listed first before anything else

Some one please help us figure these codes out and save us

Thank you

04-17-2008, 06:39 PM
Can't see all those injector circuits open, it wouldn't run, the 02 code is for the heater circuit, not affecting anything you are now experiencing. The whistle this must be tracked down first before any head gasket issues, keep checking for vacuum leaks. Clear the codes see if they return.

04-19-2008, 08:45 PM
found out the intake boot is torn but the codes will not delete but i got the 02 code to delete but the injector codes wont delete what is in common with the 1, 4, 6, and 7 injector cylinders and does anyone have the wire scmatic for the injectors?

04-20-2008, 08:07 AM
You will need a factory shop manual or a subscription to alldata.com for a diagram, what have you done in way of repair to correct the o2 issue or the torn duct, no mention of any correction.

04-20-2008, 06:33 PM
i went and got a diagram from alldata from the local library and the 4 cylinder injectors are all on the same circuit as for the o2 sensor i just deleted the code for now but the injector codes wont delete

04-20-2008, 06:38 PM
There is a fuse for the heated portion of the o2 sensor, but if 4 injectors were dead you would know it.

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