p0303 Misfire- absolutely shocked

60

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

7,665

wht yr

64,465

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 6,100
#2 pudgybear
pudgybear
Reputation 5,880
#3 dandyoun
dandyoun
Reputation 5,310
View All

Related Models For Sale

Used Ford F-150
2,195 Great Deals out of 206,316 listings starting at $1,499
Used Chevrolet Silverado 1500
1,716 Great Deals out of 175,751 listings starting at $1,250
Used Ram 1500
925 Great Deals out of 113,958 listings starting at $6,386
Used Dodge Ram 2500
159 Great Deals out of 5,240 listings starting at $3,495
Used GMC Sierra 1500
825 Great Deals out of 68,199 listings starting at $2,484
Used Toyota Tundra
444 Great Deals out of 34,312 listings starting at $2,700
Used Toyota Tacoma
542 Great Deals out of 40,814 listings starting at $2,495
Used Dodge Charger
407 Great Deals out of 28,172 listings starting at $1,988
Used Ford F-250 Super Duty
344 Great Deals out of 46,938 listings starting at $1,895
Used Dodge Challenger
184 Great Deals out of 24,169 listings starting at $8,800
Used Dodge Dakota
106 Great Deals out of 3,781 listings starting at $1,680
Used Nissan Titan
170 Great Deals out of 19,555 listings starting at $3,000
Used Ford Mustang
472 Great Deals out of 45,735 listings starting at $1,999
Used Dodge Ram 3500
90 Great Deals out of 2,181 listings starting at $4,999
Used Jeep Wrangler
277 Great Deals out of 18,163 listings starting at $2,950

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.