Shazaam! 1995 Deville DIC instant "upgrade"

[Kdirk]

Yup, what he (CaddyDaddy) said! This only instructs the IPC module (not the PCM or anything else on the car) to have the "personality" of an Eldo or Seville.

God knows, if this changed the performance of the car it'd be awful - think about it, a 4.9L Deville (or even a N*) without the Eldo or Seville suspension, powertrain and final drive ratio (among other things that make the different cars unique) that was trying to run like an Eldo or Seville would handle like $***.

It would be nice to get some kind of performance boost, but most any real change in this area has to come from mechanical mods (see the post regarding making the 4.9 a high performance power plant, in the 4.1/4.5/4.9 forum, or the recent post on the cold air intake elsewhere on this forum) followed by changes in the PCM programming to match the new mechanical parameters.

So, this change to the DIC is strictly aesthetic.

Kevin

[cadiman28]

Thank you very much, great info. Works great on my 95 Deville.

I have a Code PO52 on my display, any clues?

I just replace my power steering pump recently because the pulley broke first then I noticed the steering was rough. Replaced new pulley, pump and belt works great.

I have noticed in the past (now even more with the RPM's shown) that my car is accelerating or stays accelerated by itself. I give it gas a couple times and the rpm's come down. I have noticed the auto choke mechanism makes noises when I shut the car off. Any clues or can you point me in the right direction?

Thanks,

Ozzy

[Arkma]

Will this work on my 93 DeVille?

[Kdirk]

cadiman28,

Code P052 just means that the battery was disconnected recently (maybe when you service your power steering pump?) nothing to really worry about.

The idle speed control (motorized plunger) will sometimes "self adjust" after the car has been shut off. This is normal, but you may want to chekc toyr throttle body for excessive carbon deposits.

Arkma -

Unfortunately, this will not work on the 93 Deville. The 94 and up had a completely redesigned digital cluster vs. the 93 and back. The 94 and up had a twenty character alpha-numeric display that was capable of showing "plain text" messages right on the cluster, instead of having the two information centers and all the other status (aka "idiot") lights to indicate vehicle problems or status items like the older cluster had.

Kevin

[cadiman28]

P030 ISC RPM Out Of Range

What does this code mean?

[96CADDYDEVILLE]

Can Anyone Figure This Out For A 96 Pleaseeeeeeeeee

[Kdirk]

96CADDYDEVILLE-

I'm surprised no one with a 96 FSM has stepped up yet on this, I wish I had one so I could help you out......anyone care to take a stab at this? C'mon guys, someone here must have the book and a few minutes to read up and post on this. This assumes that it can be done on a 96 with the different (internally) class II cluster, something I cannot say for a fact.

cadiman28-

P030 - this most likely means you have carbon deposits on your throttle body that are causing the "choke" plates to hang up part way open. The ISC (idle speed control) is a motorized plunger that automatically adjusts the trottle to maintain steady idle. When the throttle body gets really bad deposits, the choke plates (which are attached to the trottle) impede the proper travel of the throttle assy, and the ISC adjusts to keep the idle where the PCM thinks it should be.

The ISC adjust however can only adjust within a certain range, and beyond that (when no more adjustment is possible by moving the plunger in or out) it pops a code telling you that the computer can no longer adjust for proper idle because the plates are being held open by deposits in the trottle body.

Here's what to do:

Take of intake/air cleaner housing. Beneath the round part there is an assembly that kind of resembles a carbeurator. There are two holes about 1.25" round covered by metal plates (these are the choke plates) if the engine is cold. If hot, they will still probably be at least part way open. By pushing these open (using the black plastic throttle cable retainer near the ISC) you can get these open all the way - make sure the car is off or you'll rev it too much by doing this - and use a top engine cleaner solvent (GM makes one you can get at dealers which works great) or a carb cleaner spray to break up and loosen the deposits on the walls inside the trottle body. You may need a toothbrush or the like to get it all off.

While you're in there, get the tubes cleaned out good also (one brass-colored tube inside each opening) this will help your air intake and improve your MPG's if they are really badly clogged. As well, if these get too bad, you will have drivability issues/poor engine performance.

You can use a piece of wire or a really small wire round brush to get at these (use top engine cleaner or similar spray here too). GM recommends the car is running while doing this part, but be advised it will smoke like a son of a gun from the exhaust, and will run rough until you're done (it is basically sucking this cleaner and the deposits thru the air intakes and burning it off in the engine). This is normal and shouldn't hurt the engine.

If this doesn't solve your problem (and the code continues to reoccur) you may have a faulty ISC motor, which is not uncommon, but less likely than the cause above.

Kevin

[cadiman28]

Kevin,

You were exactly right!!! (both times)

I cleaned out the carb and the two tubes as well. The tubes were about 1/4 of their size covered in black sut. My only mistake in doing this was using my girlfriend's toothbrush. (I was hoping to put it back once I was done) The toothbrush was a new one with some sort of styrafoam three peice design. YEPP, the carb cleaner ate away at the sponge styrafoam and I had to fish out two pcs of the toothbrush. I could smell the rest burn away in the motor (I hope)

I then took off the ISC and toook it apart. With the left over toothbrush I cleaned all the parts. It has three sprockets inside and one of them was worn away. I looked up a previous thread and bought a new ISC unit at Advanced Auto Parts.

I will install the unit at lunch time, (and hopefully the trans fluid and filter as well).

I appreciate all the help and GREAT tips.

[Eric2203]

Originally Posted by 96CADDYDEVILLE

Can Anyone Figure This Out For A 96 Pleaseeeeeeeeee

Umm... I could have sworn it showed as standard on a 96. I had one and I had it. Either that or I've lost my mind.

[96CADDYDEVILLE]

Hold On Are We Talkin About Hitting The Info Button On The Dash? As In When You Scroll Throught These Extra Things Arent Shown On A 95? They Show On My 96. I Thought This Was A Way To Have The Extras Show At The Same Time. Sorry If I Misunderstood.

[Eric2203]

Originally Posted by 96CADDYDEVILLE

Hold On Are We Talkin About Hitting The Info Button On The Dash? As In When You Scroll Throught These Extra Things Arent Shown On A 95? They Show On My 96. I Thought This Was A Way To Have The Extras Show At The Same Time. Sorry If I Misunderstood.

Yep that's what we're talking about. You already have it. 94 and 95 do not have that.

[erroneous]

.

[imaddicted2u]

Thanks, it worked on my '94 Deville. Good timing too since I've had a rash of cooling system issues, the strangest being when the drain plug on the rad decided to snap in two dumping the coolant on the road. By the time I got an engine hot warning and got it shut off, the block was so hot the starter could not turn the engine for about 15 minutes, I hope I didn't hurt my 4.9 with 310,000kms on it. The local parts shop had a replacement and after quite a time getting the old plastic bits out, the new one just snapped in place.
Two days later the metal coolant pipe that runs from the front of the engine to the heater core popped, once again dumping all the coolant. This time I got it shut down as soon as I got the engine hot warning and 400 dollars later the pipe was replaced by a caddy dealer. Amazing how the car broke in front of the dealer shop :-).
Thanks again, now I can keep an eye on coolant temp.

[ogbuehi]

I just wanted to add another successful DIC upgrade to the growing list. Step 8 was a little confusing because my display just blinked instead of changing from --- IS07 to 048 IS07. Other than that, it worked perfectly. I think I had wondered about that option when I first bought the car but quickly forgot about it because I never owned a car that gave me the option to display. This is definitely going to help me out since I've had a rash of battery/starter problems (that are all gone now). I also have a second battery installed also to help with my stereo and I would like to see it's effect on the voltage provided at times with the car not running.

I was reading the post in this thread about fixing the service ride control. What is this relay kit and where do you get one from? I've tried to read that thread about this specific problem and I saw no apparent solutions. I'm usually pretty good about following good directions but I and many others can't seem to find any info about precisely how to fix this problem on a 95 deville.

[ogbuehi]

Oh yeah for the fellow whose car runs at lower temps, my car runs at 130F so there may be nothing with your vehicle.