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post #1 of 21 (permalink) Old 09-28-2006, 10:57 AM Thread Starter
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Exclamation Need more info...quick like.

Well, yet ANOTHER issue came up with my wifes 2000 base 2.7 She called me and said that her check engine light came on and code P0303 came up (misfire detected on cylinder #3). I read another thread about possabilities on how to correct the situation, but need info as to location of things and how to do them. I cannot find my chiltons manual so I am lost.
*Where do I look for cylinders?
*Which one is #3?
*Can somebody PLEASE post a picture?
*Where exactly does the PCV valve sit on the 2.7? If it is the peice I am thinking of, it is leaking or seeping. I know I need to replace that.
I told her to try some injector cleaner as so many people answered it might be a clogged fuel injector. I will also turn the car on and check for leaks and sniff for gas tonight after I get up.
*Where exactly are the fuel injectors?
*Can they be isolated down to a certain one in order to unglog it?
*I plan on trying SEAFOAM, but where would the best place be to try and let it work on the injectors? Gas tank????
Plugs were changed about 4 months ago so they should still be okay right?
Most important question...Is she going to be safe driving the car until I can solve the issue? Please help.
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post #2 of 21 (permalink) Old 09-28-2006, 11:52 AM
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[QUOTE=silver&gold]
*Where do I look for cylinders?
They are what the pistons sit inside of. They are part of the engine block.
*Which one is #3?
It should say on you spark plug wires.
*Can somebody PLEASE post a picture?
*Where exactly does the PCV valve sit on the 2.7?
https://www.dodgeintrepid.net/forums/...&highlight=pvc
*Where exactly are the fuel injectors?
Feul injectors are what spray fuel into the cylinders to make combustion.
*Can they be isolated down to a certain one in order to unglog it?
Probably, but not sure how to do it.
*I plan on trying SEAFOAM, but where would the best place be to try and let it work on the injectors? Gas tank????http://www.seafoamsales.com/motorTuneUpTechGas.htm
QUOTE]
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post #3 of 21 (permalink) Old 09-28-2006, 12:08 PM
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[QUOTE=spaz_boy31]
Quote:
Originally Posted by silver&gold
*Where do I look for cylinders?
They are what the pistons sit inside of. They are part of the engine block.
*Which one is #3?
It should say on you spark plug wires.
*Can somebody PLEASE post a picture?
*Where exactly does the PCV valve sit on the 2.7?
https://www.dodgeintrepid.net/forums/...&highlight=pvc
*Where exactly are the fuel injectors?
Feul injectors are what spray fuel into the cylinders to make combustion.
*Can they be isolated down to a certain one in order to unglog it?
Probably, but not sure how to do it.
*I plan on trying SEAFOAM, but where would the best place be to try and let it work on the injectors? Gas tank????http://www.seafoamsales.com/motorTuneUpTechGas.htm
QUOTE]
That was probably the worst post I've ever seen. Half your answers are ueseless, and you link this guy to seafoam? Look in this guy's sig, he's the biggest fuckin seafoam user on the site. And btw, where are our sprak plug wires, i'd like to see a picture of these...
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post #4 of 21 (permalink) Old 09-28-2006, 12:10 PM
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I got a first gen. I was just trying to fucking help. Jesus christ.
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post #5 of 21 (permalink) Old 09-28-2006, 01:52 PM
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Quote:
Originally Posted by silver&gold
Well, yet ANOTHER issue came up with my wifes 2000 base 2.7 She called me and said that her check engine light came on and code P0303 came up (misfire detected on cylinder #3). I read another thread about possabilities on how to correct the situation, but need info as to location of things and how to do them. I cannot find my chiltons manual so I am lost.
*Where do I look for cylinders?
*Which one is #3?
*Can somebody PLEASE post a picture?
*Where exactly does the PCV valve sit on the 2.7? If it is the peice I am thinking of, it is leaking or seeping. I know I need to replace that.
I told her to try some injector cleaner as so many people answered it might be a clogged fuel injector. I will also turn the car on and check for leaks and sniff for gas tonight after I get up.
*Where exactly are the fuel injectors?
*Can they be isolated down to a certain one in order to unglog it?
*I plan on trying SEAFOAM, but where would the best place be to try and let it work on the injectors? Gas tank????
Plugs were changed about 4 months ago so they should still be okay right?
Most important question...Is she going to be safe driving the car until I can solve the issue? Please help.
^Cylinders are below the spark plugs( basically the plug screws into the top of the cylinder)
^#3 cylinder is the middle one on the passenger side
^PCV valve on 2.7 is screwed in to the top of the upper intake near the back,with a hose that connects it to the driver side valve cover...Probably not the cause of #3 cyl. misfire code , but never hurts to replace it..
^The fuel injectors are attached to a mounting rail and located under the upper intake plenum. They can be individually unplugged electrically to try to isolate a bad one --but this is really difficult to do with the plenum attached.. Also an injector performing bad enough to cause an individual cylinder misfire also will usually cause a slight bad idle..
^About the only way to get the Seafoam through the injectors ,without taking things apart or using other equipment will be to put it in the gas tank.,.Worth a try and it can't hurts to clean the fuel system occasionally anyway..
^Checking the condition of the #3 plug is where you need to start-- this will help you determine if the plug, coil, primary coil wire, etc is at fault.. Also will let you know if cylinder is rich or lean-maybe helping with the injector diagnosis..
^Probably not going to have any safety issues with her driving it with 1 cylinder misfireing..just wasting a little fuel $$$
ALSO might check:
Clear codes and see if it is an intermittant problem..
Pull wire off of coil with engine running, engine should miss noticably.. and then try swapping coils with another cylinder to check that coil,- code will change to another cylinder if that coil is bad..
Check for vacuum leaks aruond that cylinder's intake.

Lots of things can cause the misfire..(I think it has to misfire twice before it sets the code) i would clear the codes and if it comes back, start with taking a look at that plug, then check coil, then look for fuel issues, then vacuum leaks,compression problems,wiring faults, PCM etc.. Since the plugs and coils are so easy to get to it is a easy logical place to start..
Just my 2.7cents worth..
Good luck

Last edited by lextrep; 09-28-2006 at 03:21 PM.
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post #6 of 21 (permalink) Old 09-28-2006, 03:37 PM
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Quote:
Originally Posted by spaz_boy31
I got a first gen. I was just trying to fucking help. Jesus christ.
Ok...ok...don't be a spaz!! It does help to know what you're talking about before you post though. Carry on...
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post #7 of 21 (permalink) Old 09-28-2006, 06:03 PM
 
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post #8 of 21 (permalink) Old 09-28-2006, 06:21 PM
 
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Good post, lex. Pretty much everything I would have stated you have touched on.


Hey, silver, when's the last time the plugs ahve been changed, and how many miles are on the car?
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post #9 of 21 (permalink) Old 09-28-2006, 06:47 PM
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Quote:
Originally Posted by gordo2448
I don't suppose there's a 1st gen service manual online?


John
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post #10 of 21 (permalink) Old 09-28-2006, 07:39 PM Thread Starter
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Hey guys, thanks for the info. I just went out to her car to do a look over.

If this is the PCV valve, then it is toast. It has a split around the most upper part of it and it is spongey. I understand about the other things, but considering I am the type of person who like to start witht he obvious, I will start there. Could the PCV be an issue? I need to find my bits in order to get the coil off to check that portion, but I figure I will start with the PCV as it seems to have an obvious defect.

Spaz...thanks anyway for the help. I aint mad at ya!
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post #11 of 21 (permalink) Old 09-28-2006, 08:04 PM
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Yep, that is the PCV valve.. If the hose is spongy or split then get ready to pay$$ for this hose elbow at the dealer..You will prolly have to buy the whole hose assy..If you search there are several threads on replacing the hose and/ or heat exchanger assy... Also get the PCV valve from the dealer too some changes have been made to it.. Probably not the direct cause of the MIL light for #3 cyl. misfire-- but could be an issue since it does have an effect on air/ fuel mixture for all cylinders..
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post #12 of 21 (permalink) Old 09-28-2006, 08:05 PM Thread Starter
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Froggy....plugs were changed about 7 thousand miles ago. Is it possible to have a plug go bad and then maybe just change out the one? Car has 107,000+ on it.

I called NAPA about the PCV valve...they do not have it listed. Stealership item only I guess. Called dealer and the don't have any in stock. Saturday morning they should have one in $11.22 for the part. Gives me time to explore the other stuff.
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post #13 of 21 (permalink) Old 09-28-2006, 08:08 PM
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Quote:
Originally Posted by silver&gold
Froggy....plugs were changed about 7 thousand miles ago. Is it possible to have a plug go bad and then maybe just change out the one? Car has 107,000+ on it.

I called NAPA about the PCV valve...they do not have it listed. Stealership item only I guess. Called dealer and the don't have any in stock. Saturday morning they should have one in $11.22 for the part. Gives me time to explore the other stuff.
Quite often one plug will go bad.. if it is just change the one plug since others are not that old..And get the dealer PCV valve no substitutes!!
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post #14 of 21 (permalink) Old 09-28-2006, 08:09 PM Thread Starter
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Quote:
Originally Posted by lextrep
Yep, that is the PCV valve.. If the hose is spongy or split then get ready to pay$$ for this hose elbow at the dealer..You will prolly have to buy the whole hose assy..If you search there are several threads on replacing the hose and/ or heat exchanger assy... Also get the PCV valve from the dealer too some changes have been made to it.. Probably not the direct cause of the MIL light for #3 cyl. misfire-- but could be an issue since it does have an effect on air/ fuel mixture for all cylinders..
Thanks for the help lex! As bad as that hose is, I am thinking that might be a real good place to start. I turned the car on and didn't notice anything as far as it seeming to be off, wife said she drove fine as well. I dunno. I guess I will start with the PCV and go from there. Process of elimination. Thanks again.
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post #15 of 21 (permalink) Old 09-28-2006, 09:27 PM
 
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Quote:
Originally Posted by lextrep
Quite often one plug will go bad.. if it is just change the one plug since others are not that old..And get the dealer PCV valve no substitutes!!
Its possible for just one plug. Check that plug for any cracks or other signs of problems. Lean or rich conditions also. A cracked plug will short to ground. You can also check the spark plug boot on the end of the coil and while you're in there, check the terminal inside the boot for corrosion. By any chance has it been rainy or otherwise damn there. Silver? I had a corroded wire terminal on a caravan that acted up when it rained outside.

Good point on the dealer pcv valve, lex. The p/n is 5175350AA and i got one earlier this week. Cost me $10 and change.
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