p0303 Misfire- absolutely shocked

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

6,735

wht yr

58,315

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

Search Dodge Ram 1500 Questions

Dodge Ram 1500 Experts

#1 Dan Connell
Dan Connell
Reputation 5,390
#2 pudgybear
pudgybear
Reputation 5,120
#3 dandyoun
dandyoun
Reputation 4,750
View All

Related Models For Sale

Used Ford F-150
3,379 Great Deals out of 203,977 listings starting at $1,273
Used Chevrolet Silverado 1500
2,603 Great Deals out of 149,100 listings starting at $1,800
Used Ram 1500
1,387 Great Deals out of 113,748 listings starting at $6,999
Used Dodge Ram 2500
174 Great Deals out of 5,610 listings starting at $2,900
Used GMC Sierra 1500
1,143 Great Deals out of 57,998 listings starting at $995
Used Toyota Tundra
662 Great Deals out of 28,232 listings starting at $1,599
Used Toyota Tacoma
779 Great Deals out of 33,337 listings starting at $1,900
Used Dodge Dakota
139 Great Deals out of 4,328 listings starting at $900
Used Dodge Charger
550 Great Deals out of 28,745 listings starting at $2,275
Used Ford F-250 Super Duty
479 Great Deals out of 42,555 listings starting at $2,995
Used Nissan Titan
219 Great Deals out of 14,499 listings starting at $3,500
Used Dodge Challenger
433 Great Deals out of 25,173 listings starting at $7,980
Used Dodge Ram 3500
85 Great Deals out of 2,413 listings starting at $5,000
Used Ford Mustang
727 Great Deals out of 38,316 listings starting at $1,750
Used Chevrolet Tahoe
1,063 Great Deals out of 32,232 listings starting at $1,495