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2003 Northstar 4.6 L V8 VIN #Y. Engine runs rough. No problem with acceleration though. Replaced spark plugs and coil boots to no avail. Warning engine light still lights. OBDII says lean on banks 1 & 2. My mechanic syad I neede to replace the coil packs but, I don't see how that would help. Any suggestions?

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Posted on Jan 02, 2017

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SOURCE: I HAVE A 1998 FORD EXPLORER AND IT HESITATES ON

Try running some fuel injector cleaner through your fuel tank. What you may have are a couple of plugged or missfiring fuel injectors. I would suggest checking all of your wiring to your injectors to insure good connection, replace your fuel filter and check for vacuum leaks.

Posted on Jul 20, 2009

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SOURCE: 1999 deville 4.6 northstar engine

say what?

Posted on Aug 18, 2008

  • 41 Answers

SOURCE: car won't pick up speed on acceleration

You're not getting enough fuel. You should check your fuel pressure. If you have enough fuel pressure, your injectors are probably clogged up. Run a lot of fuel cleaner through your tank when you put gas in and see if it makes any difference. Lucas fuel treatment is the best to use.

Posted on Apr 26, 2009

  • 1071 Answers

SOURCE: CHECK ENGINE CODE P0171

there is only one bank on a pt cruiser and yes it could be a fuel pump or a vacuum leak

Posted on Aug 06, 2009

  • 44 Answers

SOURCE: 2004 caddy deville customer changed

change coolant temp sensor. it will be reporting wrong leading to the misfire.

Posted on Aug 21, 2009

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P1312 2003 rodeo 3.2L and poor acceleration


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Hello Bret.
These codes are indicating engine misfires. 303 is cylinder #3 and 304 is cylinder #4. The 316 indicates that the misfire happened in the first 1000 revolutions.
These trucks are notorious for misfires. The most common issue is ignition coil failure. Failure on these coils can be accelerated though by spark plugs that are worn and contamination from oils, antifreeze leaks and water.
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Where are the spark plugs located? and how do I get to them?


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Oct 20, 2009 | 2003 Cadillac Deville

2 Answers

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I'm not sure if the Northstar has it anywhere. Just for your info though, the firing order is as follows:
1-2-7-3-4-5-6-8


3f369ba.jpg

Fig. 4.6L (VIN 9 and Y) Engines Firing order: 1- 2- 7- 3- 4- 5- 6- 8 Distributorless ignition system


Hope helped (remember rated this help) Good luck.

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