p0303 Misfire- absolutely shocked

100

Asked by Oct 21, 2014 at 10:07 AM about the Dodge Ram 1500

Question type: General

I own a 116,000 mile Dodge Ram Laramie 1500 5.9  thats driving me nuts.
Bought the truck in Connecticut and drove it home thinking it just needed a tune up. The truck sat for almost 6 years in a heated climate control garage. It is in excellent shape but it sat for a while, so I went right through it with the following.

ALL OEM replacement parts
New cap rotor and distributor ( tapped out too much and effected the cam sensor movement)
new plugs, wires, all new fuel injectors (8) in total.
New evap canister valve.
New ignition control sensor and CKP sensor
New Collant temp sensor
New throttle body with all new sensors, MAF, IAC and Throttle sensor
New radiator, water pump and all new lines
Put it on my buddies Modis computer and timed new distributor to top dead center 0.
Was running rich, ( leaky injector) fixed and replaced.
Now that all this work was done, it now randomly throws a p0303 code on bank 1.
Tested the fuel pressure ( 49 PSi) right on the money and even at higher RPM's dead on.
Did a compression check, all was perfect no issues.
Are their any wiring issues on these trucks? Could it be an electrical thing? Is there a place where they come together in the back behind the distributor? or do I have to chase the the fuse box or PCM?

I need some help on this one, I am stumped. The only thing I can think of is it has to be electrical.
Any help would be greatly appreciated.

2 Answers

8,045

wht yr

68,365

Compression check will not show a scorched valve,this will give you the misfire,and is hard to diagnose,the only reason i say this,my 99 silverado did it,and beat my head in ,spent lot,s of money,and still had the skip,story sound famiular?Remove the head,on the side of the number 3 cyclinder,you will more than likely find this issue.

Your Answer

Dodge Ram 1500 Experts

  • #1
    Dan Connell
    Reputation
    6,460
  • #2
    pudgybear
    Reputation
    6,260
  • #3
    dandyoun
    Reputation
    5,700
View All

Related Models For Sale

Used Ford F-150
2,294 Great Deals out of 183,734 listings starting at $699
Used Chevrolet Silverado 1500
2,075 Great Deals out of 165,774 listings starting at $1,900
Used Ram 1500
940 Great Deals out of 111,301 listings starting at $6,499
Used Dodge Ram 2500
161 Great Deals out of 4,998 listings starting at $2,499
Used GMC Sierra 1500
862 Great Deals out of 65,004 listings starting at $2,495
Used Toyota Tundra
435 Great Deals out of 32,023 listings starting at $1,999
Used Toyota Tacoma
627 Great Deals out of 42,344 listings starting at $1,500
Used Ford F-250 Super Duty
352 Great Deals out of 44,600 listings starting at $1,799
Used Dodge Charger
396 Great Deals out of 27,756 listings starting at $1,979
Used Nissan Titan
213 Great Deals out of 19,918 listings starting at $3,495
Used Dodge Challenger
274 Great Deals out of 22,223 listings starting at $6,999
Used Dodge Dakota
113 Great Deals out of 3,740 listings starting at $1,000
Used Chevrolet Colorado
269 Great Deals out of 31,361 listings starting at $1,995
Used Dodge Ram 3500
83 Great Deals out of 2,233 listings starting at $3,950
Used Ford Mustang
678 Great Deals out of 37,810 listings starting at $895

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.