Question about 2005 Cadillac STS

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The bigger your engine compression ratio is... the higher the fuel octane that you have to use to reduce carbon deposits. If you value your car and will keep for a long time then use the higher octane. Otherwise, use the low-octane since price of fuel is steadily going up. Your's to decide.

Posted on Oct 07, 2010


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My 2005 gmc envoy runs smooth in park but pings in drive sounds like a diesel truck and has no check engine light on

Does the vehicle have VVT ? The Inner Workings of Variable Valve Timing Engine Builder Magazine
Do you change oil regularly ? What cause's pinging ? Do you know ? Timing advanced , low octane fuel . I had a dodge truck back in the 90's ,was suppose to run on regular gas ! Pinged like crazy unless i use hightest . I don't know if a stuck advanced cam phaser would cause this or not . Just something to look at . Or the computer is advancing the timing for some strange reason .

Apr 14, 2017 | GMC Cars & Trucks

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Jumped time

A blast from the past (fav. movie)
i love caps, snaps me back to my first home computer (Northstar z80)
and my silly ASR33, printing terminal, caps only, flash ! im there....
misfires on all 6 cylinders. if patient,.
what car? what engine? what year?
1150 AFR bad.
1346 VVT says, cam is bouncing like MAD (DEVIATIONS) bank1
1349 VVT frozen, means it can change it ,but how could it if it bounces. bank 1
1351 VVT Sensor Range/Performance Problem (Bank 2)

here is my guess , your engine is????
2.5,3.0,3.3,3.4,4.0lilter engines,

new belt ,why old one snapped or shredded? or worse slipped?
my guess, bad belt setup, not timed right. or bad tensioner. bad idlers, or
or bad VVT parts, or bent head valves.

the V6 may be interference, and TOY dont say, but Gates lists most 96 and newer as Interference...engines.
i will assume it is (this is 1st deal with me, as im ,FIRST do no HARM"
and these engines , what do i do?
i do a leakdown test, just after the belt is replaced and tensioned, turning engine by hand.
if the leak down test FAILS the belt snapped and the valves did hit.
this i do everytime, it takes me, what 30 more minutes?
this act prevents further damage to head and pistons and rod bearing.
the damage can cascade fast to needing a new engine. now..
IMO, good luck.

Jan 02, 2014 | Toyota Cars & Trucks

1 Answer

I have a vacuum leck on top front side of moter i need see part

Northstar engines are known for intake manifold leaks and also for intake manifold coupler leaks. I do not know what else you could be describing. The only "black cover" I can think of would be the intake manifold. There is not much of anything else on top of a Northstar engine.(except the silver plastic cover that has "32V Northstar" moulded into it.)

Jan 24, 2012 | 1999 Cadillac DeVille

2 Answers

I am writing asking for help to address what I consider an unacceptable response from a Cadillac mechanic when asked to evaluate a valve-like noise coming from my 2008 SRX Cadillac NorthStar VVT V8 engine....

What type of gas are you running in the north star? what you describe sounds like a valve rattle from preignition what i would do 1rst is fill the car up with premium gas (93) octane it will be expensive but a lot cheaper than running to the dealership drive the tank till empty and then resume as you were if this solves your problem you just saved yourself a few hundred dollars if not go to someone like auto zone and have a diagnostic done to see if any codes are stored there may be something with the timing of the anti knock sensor could be bad i would try these steps first before spending all of my money at the dealership if all else fails you can call gm yourself and see if they are having similar complaints from other customers. hope this at least get you started on the right road.

May 18, 2011 | Cadillac SRX Cars & Trucks

2 Answers

Does the 09 es350 need 93 octane gas or will it run on 87 octane

you should have a factory affixed sticker inside gas compartment cover listing premium fuel only or also listed in your owners manual. Otherwise if you notice that you're vehicle is making a pinging sound while accelerating or climbing a hill for instance then you may want to step up to 89 or 93 octane and try to avoid purchasing fuel with ethanol added it's **** and degrades your fuel quality/octane ratio

Dec 23, 2010 | Lexus ES 350 Cars & Trucks

2 Answers

Where can i find an engine for a 96 cadillac deville 32v northstar.

possibly at wrecking yard but make sure you pay for warrenty in case you get a bad one

Apr 14, 2010 | 1996 Cadillac DeVille

2 Answers

I cant find the starter

This might be the engine where the starter is located IN the engine itself. Have to take apart the whole top half of the engine to get at.

Mar 07, 2010 | 1994 Cadillac Eldorado

2 Answers

What octane fuel used in 98 Cadillac 4.6

having over 30 years with general motors and 10 with cadillac the standard 87 octane can be used in your northstar engine
premium is noted on the dash cluster to the owner of course for the price they paid for a 300 horsepowered engine seems they octane should be using the highest made octane to use. it is another bad reflection from general motors in their part. I owned a 96 de ville and always ran 87 octane and took it out west in 98. I cruised at 90 mph through Nevada and received 29 mpg

Mar 03, 2010 | 1998 Cadillac DeVille

1 Answer

How to repair a sticky vave on a 2002 eldorado northstar?

those 32v northstar engines are notorious for valve problems. not any real easy way. get the heads pulled and take them to a machine shop. gonna cost you about $1500-$2500 us

Oct 10, 2009 | 2002 Cadillac Eldorado

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