p0303 Misfire- absolutely shocked

90

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

7,905

wht yr

66,705

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

Add photo

Related Questions

  • p0303 Misfire- absolutely shocked 2 answers

    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 heate...

    Dodge Ram 1500

    -

    General

  • Misfire 2001 dodge ram 1500 5.9 v8 3 answers

    My trucks heater core went and that caused my water pump seal to leak. Right before that my truck started to shake and run rough. I scanned it and it threw the random misfire codes for cylinders 3...

    2001 Dodge Ram 1500 4 Dr SLT Quad Cab SB

    -

    General

  • misfire on #4 and #6 cylinder. 4.7 3 answers

    replaced plugs, coils, injectors, head gasket and had head machined and cleaned

    2004 Dodge Ram 1500 ST LB

    -

    General

  • Dodge RAM 1500 3.7L V6 4 answers

    Car was purchased from a storage had it towed home started truck and ran. Son decided to rev engine with old gasoline and it wouldn't turn on. Changed the fuel pump now I have to pump the gas to s...

    2007 Dodge Ram 1500 ST

    -

    General

  • 1998dodgeram1500misfirecylnder8 5 answers

    MISFIRE CYLNDER8 CHANGD PLUGS INTAKE GASKET STILL MISFIRN

    1998 Dodge Ram 1500 2 Dr ST 4WD Standard Cab LB

    -

    General

Search Dodge Ram 1500 Questions

Dodge Ram 1500 Experts

#1 Dan Connell
Dan Connell
Reputation 6,270
#2 pudgybear
pudgybear
Reputation 6,130
#3 dandyoun
dandyoun
Reputation 5,510
View All

Related Models For Sale

Used Ford F-150
2,086 Great Deals out of 191,509 listings starting at $290
Used Chevrolet Silverado 1500
1,930 Great Deals out of 182,792 listings starting at $999
Used Ram 1500
925 Great Deals out of 112,957 listings starting at $5,386
Used Dodge Ram 2500
122 Great Deals out of 5,087 listings starting at $2,999
Used GMC Sierra 1500
790 Great Deals out of 68,235 listings starting at $1,800
Used Toyota Tundra
447 Great Deals out of 34,302 listings starting at $1,950
Used Toyota Tacoma
562 Great Deals out of 42,404 listings starting at $1,995
Used Dodge Charger
535 Great Deals out of 28,340 listings starting at $2,500
Used Ford F-250 Super Duty
326 Great Deals out of 43,864 listings starting at $1,450
Used Nissan Titan
173 Great Deals out of 18,905 listings starting at $3,995
Used Dodge Dakota
125 Great Deals out of 3,790 listings starting at $1,500
Used Dodge Challenger
248 Great Deals out of 22,384 listings starting at $7,995
Used Chevrolet Colorado
246 Great Deals out of 27,749 listings starting at $1,000
Used Ford Mustang
689 Great Deals out of 44,321 listings starting at $1,500
Used Dodge Ram 3500
68 Great Deals out of 2,104 listings starting at $6,969

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.