Question about 2002 Cadillac Deville

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Need good fuel injector cleaner

What kind of injector cleaner is good for a 2002 cadillac with a northstar engine?

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B12 chemtool u can buy it at walmart

Posted on Apr 09, 2010


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Check engine light flashing check engine soon smell of gas and not running smouth

Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD

Feb 03, 2016 | 2004 Cadillac Deville


CADILLAC Northstar starter replacement

I had seen an abundance of questions on "Were is my starter for my Cadillac Northstar engine?" Yes it is very had to see one unless you have a crystal clear engine for it is mounted under the intake inside the engine.
An experience Cadillac tech can have one replaced in less than an hour. I see some do it in 30 minutes and less. (They have replaced hundreds of them through the years made) Changing one is quite simple and a cleaner way of doing it also having it mounted inside. It stays fairly clean through the years.
No gaskets are needed unless you destroy yours somehow

on Feb 27, 2010 | Cadillac DeVille Cars & Trucks

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Have a 2004 cadilac deville with northstar engine in it got a to re place fuel injector how do you do it

there's a shraeder valve to easily de-pressurize the fuel system before working on removing the injector...

you need to remove that plastic "beauty plate" to see the intake plenum/ manifold

he shows you how to unplug the electrical connector from that fuel injector

from there, someone else maybe chime in on how to disconnect the hose from the injector if you have a similar setup as that youtube link

PS: make sure you lube the o-ring of the injector before installing How to change fuel injectors

Apr 03, 2015 | 2004 Cadillac DeVille DTS

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Why am I getting engine code 306 and and code 206 on 2004 Cadillac cts 3.6 eng

The fuel injectors are not working as the should. Run some premium fuel and fuel injector cleaner to try and make problem go away.
It problem persists the injector computer circuit voltages require checking. Possible injector controller or injector replacement could be solution.

Oct 09, 2014 | 2004 Cadillac CTS

1 Answer

I have a deville dhs with northstar and I've been told that the "computer is going out" - what might the repair cost be

You can purchase Salvage units at This is a nationwide network of Salvage yards which have some warranties, ship to your door and provide you some choices in prices and condition of the parts.

You can also look to the internet and search for rebuilt brain units.

If you are having drivability problems, you can tell us why someone thinks its the computer. For instance, the Northstar engine requires a special solvent to be introduced into the fuel injectors annually. This strong chemical needs to sit overnight inside the engine to work.

Your valves can soot up without this periodic service.

Sorry, can't give you a price for either repair, but Salvaged parts can be good especially with rear end collisions or trans failures. Front end collisions with the engine on may have a shorted brain. You will see a large variance in offered prices.

Please rate my info.

Dec 18, 2012 | 2002 Cadillac Deville

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I have a 2002 cadillac dhs my service engine light came on. got codes P0174 and P171 could you tell me what they mean

P0174 System Too Lean (Bank #2)
P0171 System Too Lean (Bank #1)

System to lean means that a fuel injector or injectors may be plugged up, or the oxygen sensor is sensing too lean of a condition.

How many miles do you have on this engine?
Have the O2 sensors ever been changed?

When was the last time you had a tune up?

Dec 18, 2010 | 2002 Cadillac Deville

2 Answers

Please describe your what is the number one cause of a northstar cadillac sts 96 to not start and run but turn over but it acts like it wants to run but just wont fire checked the fuel pump and it is...

There can be a misfire too from the cylinders.

An engine that hesitates, stumbles or misfires when accelerating or when it is under load is an engine that is either sucking too much air, not getting enough fuel or misfiring. If the Check Engine Light comes on, you may find any of the following codes:

• P0171, P0174 Lean fuel condition codes
• P0120 to P0124 Throttle position sensor codes
• P0222 to P0229 Throttle position sensor codes
• P0400 to P0409 EGR related codes

If there are no misfire codes, a common cause of acceleration stumble is a bad throttle position sensor (TPS). The TPS tells the computer how far the throttle is open. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture and when extra fuel is needed if the throttle suddenly opens wide.

Another common cause is dirty fuel injectors. If varnish deposits have built up in the tips of the injectors, they won’t spray as much fuel as they normally do, or will “dribble” fuel instead of spraying a fine mist. This creates a lean fuel mixture and conditions that are ripe for stumble and hesitation (also misfire). Look at short term fuel trim (STFT) and long term fuel trim (LTFT) with your scantool. If the numbers are high, it tells you the engine is running lean and the injectors need cleaning. Treat mild cases with a high quality fuel-injector cleaner additive. Severe cases require professional cleaning equipment.

Also if this sensors apply to your vehicle, camshaft sensor or crankshaft sensor if sensors bad you don't get any spark.

Good luck and rate this solution, please.

Mar 16, 2010 | Cadillac STS Cars & Trucks

1 Answer

Idles high, running temperature is 225 degrees and have to push on accelerator to start


are you familiar with the northstar engine?
first generation northstars are notorious for this kind of thing..
the engine is prone for metal fatigue/ warping of the heads, and stripped out head bolts, do you have documentation and service history for it?
these engines need a good mechanic to inspect and replace head bolts which strip out and need fixing. I will post a link at the bottom
once the engine is repaired correctly it should last a good long time
have it fixed correctly. I think someone has turned up the idle knob in an attempt to get the coolant flowing quicker to keep it cool.
its worth repairing if you have the money..


Nov 29, 2009 | 1993 Cadillac Eldorado

1 Answer


this cars are very coming with the leak at the fuel pressure regulator, all you have to do is locate the regulator for the fuel, it is on the fuel injector rail, and unplug the vacum hose if you see any fuel or smell like fuel inside the hose that means the regulator has to be replaced,

May 27, 2008 | 1996 Cadillac DeVille

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