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Old 04-19-2007, 05:06 PM
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firing order

did the firing order change from the 70s 350cid to the 90s 350cid?

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Old 04-19-2007, 05:25 PM
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Nope, it's still 1-8-4-3-6-5-7-2

Vince
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Old 04-19-2007, 05:26 PM
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wats the firing order for a 307?
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Old 04-19-2007, 05:44 PM
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Doc here,

1,8,4,3,6,5,7,2

Drivers side bank, 1, 3, 5, and 7.

Passengers side bank, 2, 4, 6, and 8.

Direction of rotation is Clockwise.

# 1 plug tower, traditionally is 5 to 7 O'clock.

Good static timing starting point is 8 to 12 degrees.

Doc
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Old 04-19-2007, 05:53 PM
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somthing is wrong with my motor its a 350 tbi and it starts but shakes violently and eventually turns off. i've checked the firing order and its ok. all help would be appreciated thanks
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Old 04-19-2007, 06:11 PM
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sounds to me that its out of time one clog i had the same problem with my 350 carb i poped the dizzy and moved it one tooth and it ran fine after that if that dont work try the plugs and wires and test the coil to see if your getting the right volts and check the injectors to see if there clean something could be pluged up in there and its not getting enough fuel

hope this helps

Ed
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Old 04-19-2007, 06:20 PM
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Is the timing on that TBI engine computer controlled? How do you set the timing without throwing the computers timing curve out of whack?

88chevy, were you tinkering with something and did the engine start to run like this after messing with the engine? Has it always run like this?

Just curious, you first asked about the firing order of a 307 then about the 350. Were you mixing and matching some parts?

If you're suspecting something ignition related then double/triple check that you didn't swap the #5 and #7 plug wires somewhere along the line. This can be very easy to do...
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Old 04-19-2007, 06:32 PM
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Doc here,

Pull the codes, this will lead you to the AREA of the problem..Remember because the reader says a Sender is bad , doesn't always mean it is bad..It means the problem exists between the bad reporting sensor and the last known good reporting sender.

With what limited info you gave Do all the basics First..

Pull the plugs..what is their condition? Wet, Dry, Sooty black, rusty brown, clean white with "Flecks"? Do they need replacement? Gap set at 40 to 45 thousands?

Do a Compression test..125 to 150 PSI +/- 10 % all the way around, Choke open, throttle plates at WOT..Dry , then wet..

Do a vacuum Test..17 to 21 In Hg is normal, at curb idle and steady needle.. Low Vaccum, look for leaks..Bouncing needle, think Valves..

Check your fuel filters, Clean and/Or replace them. DO a fuel pressure / Volume test at the fuel rail / line..should be around 45 psi IIRC.

Pull the Ignition Module and have it tested (freebie at auto Zombie)

Check the primary and secondary resistance of the coil..if out of spec, replace it..

If you have one, check the crank sensor for tight plug, clean off the grease, be sure it is not bent or mis~aligned..from hitting road fodder..

Check and clean the MAF..

Test the injectors, 12 volts on the RED wire, and steady flash on the black with a Noid Lamp...

Check all the fuses, especially any marked ECM, ECM, IGN, INJ 1/2, ECU~A,B,Or C..

Without more information, like what happened to cause this, Overheat, ran without oil, caught in a flood up to the windshield, or 'It just happened" ..and a bit more descriptive post of what it is doing..you need to do all the testing first and post it, so we may better help you..

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Old 04-19-2007, 07:04 PM
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alright thanks guys for the help ill get back to you all
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Old 04-19-2007, 07:21 PM
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TBI fuel pressure should be 9-14 PSI
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