Jump to content
  • RECEIVE THE GIFTS MEMBERS SHARE WITH YOU HERE...THEN...CREATE SOMETHING TO ENCHANT OTHERS THAT YOU WANT TO SHARE

    You know what we all love...

    When you enchant people, you fill them with delight and yourself in return. Have Fun!!!

Sign in to follow this  
BoxMN

98 k1500 p0303 code

Recommended Posts

I drove to North Dakota this past weekend pulling a fairly big trailer load of timbers and tools and such (basement wall caved in, had to do emergency fix on the duck hunting camp...) Truck is 98 k1500 with 5.7 and 200k miles. Drove great up there, going about 70 with trailer.

On the way back, the trailer was lighter, only had a few spare timbers and a potato cultivator, and truck was lighter too. But we were driving about 80+. I noticed it seemed a bit sluggish at times, and felt a shudder now and then. The service engine soon light came on about Fargo. Checked the code today it was

p0303 misfire in cylinder 3.

Can't recall when I did plugs last, but I bet about 60-70k miles. Used ac delco plugs and wires, the good ones. Could it be just as simple as time to change plugs and wires again? Truck runs and starts great. I cleared the code but havent driven it since. Goiing to be using it for a week in late july so I want to try to fix it if I can.

Thanks for any advice!

-Box

Share this post


Link to post
Share on other sites

If the correct plugs where installed than they should be good for about 100k. You are not far from needing to replace them again.

Another thing you can do is swap the coil with the 2,4,6, or 8 coil and see if the misfire follows the coil. If it does you know the coil will also need to be replaced.

Share this post


Link to post
Share on other sites

I have been running into some issues with Ac Delco spark plugs lately, and melting down on this era GM trucks. I would start with a new plug in the #3 cylinder before throwing other parts at it.

Share this post


Link to post
Share on other sites

 

Another thing you can do is swap the coil with the 2,4,6, or 8 coil and see if the misfire follows the coil. If it does you know the coil will also need to be replaced.

 Only one coil on the 98.  Not uncommon for cap or rotor to be bad though.  I would also start with the plug and/or wire, otherwise you may be looking at an injector.

Share this post


Link to post
Share on other sites

 

 Only one coil on the 98.  Not uncommon for cap or rotor to be bad though.  I would also start with the plug and/or wire, otherwise you may be looking at an injector.

​5.7 liter........... my bad!

Share this post


Link to post
Share on other sites

Thanks guys. Off to my parts guy, start easy and go from there!

Share this post


Link to post
Share on other sites

Just a quick follow up... I put in new plugs and wires, and it ran fine. no codes. Then first trip about about 150 miles, it stuttered and died, then started right back up but running rough. Next morning ran good until it sat for awhile then didn't want to start, had to push pedal to floor like it was flooded. Checked plugs and bad #3 again, it was dark crud on plug, same as older set. Put in new dist. cap and rotor, and cleaned the plug (it cleaned easy). Ran good. But then another code and rough running.

Checked code and it was p0118 (i think) which was a error in engine coolant temp. I never saw a hiccup on my temp gauge and have plenty of coolant. The Google ;) told me normal fix was replacing the ECT sensor. so I did, $20 at napa. It is like a new truck again. so now have new plugs, new wires, new cap and rotor. running good.

My guess is the sensor was telling it run rich?.... which fouled the plug(s) and make it run like carp. I was thinking way more serious... glad it was easy and cheap fix.

Now to fix that darned trailblazer axle seal...

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

  • Your Responses - Share & Have Fun :)

    • icefishinnut gets 2nd win with a 301 score.. 2--rl_sd                     298 3--BlackLundProV  293 4--Fishing_Novice   285 5--mnwildman         284 6--Juneau4               282 7--Swiveldigger       275 8--huckfin                 274 9--Rip_Some_Lip     244 ___________________________________________________ SEASON TOTALS 1--Fishing_Novice           5274 2--BlackLundProV           5126 3--huckfin                         5094 4--Juneau4                       5076 5--Rip_Some_Lip              4952 6--Swiveldigger                4876 7--rl_sd                              4825 8--icefishinnut                  4804 9--mnwildman                  4780
    • Box? i don't think I've ever seen them but will be looking in a little while
    • Buy a box of cheesy tots.  Cook.   Use rack over sheet pan on grill or in oven.  😀
    • Cheesy tots sound great! Anyone got a recipe?
    • If you're feeling adventurous some time follow the same process you just explained but instead of using a rib rub try using a generous amount of Montreal Chicken seasoning with yellow mustard as your glue.  Also, try a wing or thigh before using the Famous Dave sauce.   Goof Luck
    • I took wings, thighs and legs and put rib rub on them and let them sit for 4 hours then I smoked them for about 90 minutes this morning. Tonight I put them on the grill to crisp up and slathered with Famous Dave's. I seem to kill chicken on the grill but with the smoker I can regulate better plus all that flavor. Only way I'll do chicken now!
    • The grain belt is a bigger sin.😁
    • Yes, I noticed the bottled water in the back👺
    • I did 2 racks of St. Louis style ribs on the pellet smoker yesterday, rubbed with smoky mesquite seasonings...  so good no bbq sauce was used when they were eaten!!!  did the 3-2-1 method but used different temps from the last time I did them...  started at 175 for 3 hrs, then 230 wrapped and finished unwrapped at 230...  Oh Yea!!!
×