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firing order on my chevy 305 ,PLease help me??
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M.J.D_76_09
New User
Jan 25, 2010, 3:04 AM
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firing order on my chevy 305 ,PLease help me??
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hey
i drive 1983 Chevrolet Caprice Classic 4DEstateWagon V8-305ci 5.0L 4 BBL
Vin H #3165, i change the engine oil & spark plugs about one week ago.
the engine was runing good before i did this change.
specifically after i change spark plugs (ACDELCO'R45TSX'), the engine
start chake and i start hear a high flow air sound between cylinder
NO.3and7, in th driver side.
ithought i install the spark plugs wires wrong.
i run to the web and search for the correct firing order on my chevy 305
engine which i find this picture.
i change all my spark plugs wires as the picture below, then i start the
engine it dosn't work and awhite smoke get out from my carburetor , its
terrified me to death i thing iblow the engine.
after that i reinstall spark plugs wires as i remember and i still feel
the chake in the engine and hear a high flow air sound between cylinder
NO.3and7, in th driver side.
please help me.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2010, 3:32 AM
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Re: firing order on my chevy 305 ,PLease help me??
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1983 Chevrolet Caprice
5.0 liter V-8 VIN "H" 4-bbl 
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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M.J.D_76_09
New User
Jan 25, 2010, 6:06 AM
Post #3 of 8
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Re: firing order on my chevy 305 ,PLease help me??
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thank u Hammer Time bbut i try firing order 1-8-4-3-6-5-7-2
but the engine dnt start and white smoke get out from my carburetor,
why that happen??
now i run my engine in this firing order 2-1-8-4-3-6-5-7 and i fell the chake in the engine.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2010, 6:38 AM
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Re: firing order on my chevy 305 ,PLease help me??
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All I can tell you is that I gave you the correct firing order for the engine you gave me unless it's a reverse rotation marine engine.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 25, 2010, 7:30 AM
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Re: firing order on my chevy 305 ,PLease help me??
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mjd: Look carefully at the graphic Hammer posted. Is the green in the right spot? It could be off one hole place all the way around. Check that rotor, rotates at it shows. Some truck engines and marine as HT said engines were counter rotating. I don't recall that for cars,
T
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Sidom
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Jan 25, 2010, 1:10 PM
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Re: firing order on my chevy 305 ,PLease help me??
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The only other bit of advise I will offer is, you may want to pull the #1 plug & bring it up on the compression stroke and see where the rotor is pointing to in the cap to see where the actual #1 is on the this engine.
These engines you can put #1 where ever you want it. A tech should put it back according to the factory diagram HT posted if he's had the dist out, but I've seen them all over the board.
Got my azz chewed out 30 years ago for doing the same thing.......
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Loren Champlain Sr
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Jan 25, 2010, 6:02 PM
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Re: firing order on my chevy 305 ,PLease help me??
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mjd; All of the advise above is correct. Check for any vacuum leaks. The only thing that I can think of that could affect #3 & #7 would be the EGR valve. Make sure that you don't have manifold vacuum going to it. Should be ported. To expand on Sidom's advice; As he said, remove #1 spark plug. Disconnect the electrical connection going to the distributor so that you don't get zapped by the coil. Have a helper 'bump' over the starter until you feel the 'push' of compression from the spark plug hole. This will be the compression stroke. Line up the timing mark on TDC. Remove the distributor cap and note where the rotor is pointing. This will be #1, the starting point for your firing order. The rotor turns clockwise. The driver's side of the engine is numbered, front to rear, 1-3-5-7, passenger side front to rear, 2-4-6-8. Once you determine where #1 is on the distributor, then it is: 1-8-4-3-6-5-7-2. The backfiring you describe would suggest that you probably have a couple of wires crossed. Very common mistake. The backfire can cause a fire in the carburetor. Be prepared, just in case. A bunch of rags handy to 'smother' a backfire usually works. Worse case would be a fire extinguisher. Those make a terrible mess and usually result in rebuilding the carb, but will save the rig.
Loren
SW Washington
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M.J.D_76_09
New User
Jan 26, 2010, 2:24 AM
Post #8 of 8
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Re: firing order on my chevy 305 ,PLease help me??
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Thank you all I will try Loren Champlain Sr
tips in this Sunday so I have time to rebuild the carb. If I need to.
Then I will tell u the result.
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