P300 on vortec v6 why
10

Asked by joel2270 Jul 27, 2014 at 02:17 PM about the 1997 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: General

I have a 1997 GMC 1500 with a 4.3 Vortec
v6 it has a p 300 random multiple cylinder
misfire code I have change distributor cap
rotor button and distributor and plugs and
wires cam sensor crank sensor and iCM
also did intake manifold gas.ket set
complete what else is causing it

6 Answers
144,795

T_S_T answered 10 years ago

Warped valve,check compression on all cylinder,s,one is leaking down,got same 4.3 in my silverado,went threw same as you ,replaced all,and found valve warped.

Mark helpful
10

joel2270 answered 10 years ago

But it's only got 42000 on moter and it would only show one cylinder misfire if it was a valve correct

Mark helpful
144,795

T_S_T answered 10 years ago

Not really,mine had 3 warped valve,s on different cylinder,s,being warped cause them to seat and sometime,s not,causing my random misfire on different cylinder,s.But that said check compression to rule me out.

Mark helpful

Your Answer:

Related Questions

  • P300 on vortec v6 why 6 Answers

    I have a 1997 GMC 1500 with a 4.3 Vortec v6 it has a p 300 random multiple cylinder misfire code I have change distributor cap rotor button and distributor and plugs and wires cam sensor crank sen...

    1997 GMC Sierra 1500 C1500 SL Extended Cab SB

    -

    General

  • Why is my service brake system light on 2 Answers

    I have a 2003 gmc Sierra 1500 4x4 I got stuck and put the truck in 4 wheel drive to get out then put it in drive and moved, then it wouldn't move at all saying my service brake system and brake li...

    2003 GMC Sierra 1500 SLE 4WD Extended Cab LB

    -

    General

  • Truck won't start when heater controls don't come on why 2 Answers

    Why does my 92 gmc not start when the heat controls don't come on the rest of the dash is working but not the heat I've changed the relays and tried everything I could think of still nothing the tr...

    1992 GMC Sierra 1500 C1500 SLE Standard Cab LB

    -

    General

  • How can I tell what automatic transmission my GMC Sierra Ext. Cab 1500 5.0L Vortec has in it? 4 Answers

    I need to know the transmission model in my GMC Sierra Extended Cab 1500 long bed 5.0L Vortec has in it so I know the filter and fluid capacity to change it.

    1998 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    General

  • Why was the trim filter removed from CarGurus? 1 Answer

    The search or filter function on trim type is not available. why?

    2020 GMC Sierra 1500 Denali Crew Cab 4WD

    -

    General

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 7,231 nationwide Sierra 1500 listings starting at $3,950.

Postal Code:

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,840
  • #2
    dragonflyoffshore
    Reputation
    11,750
  • #3
    John Saffrahn
    Reputation
    11,690
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
338 Great Deals out of 15,288 listings starting at $1,712
Used GMC Yukon
11 Great Deals out of 947 listings starting at $1,225
Used Toyota Tacoma
60 Great Deals out of 1,065 listings starting at $8,708
Used Dodge RAM 1500
4 Great Deals out of 71 listings starting at $4,000
Used Chevrolet Tahoe
22 Great Deals out of 922 listings starting at $11,900
Used Chevrolet Corvette
26 Great Deals out of 1,064 listings starting at $15,871

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. Content will be removed if CarGurus becomes aware that it violates our policies.