460 sputter
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Tuned
Joined: Nov 2007
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460 sputter
I replaced my other 460 efi that was giving me fits. But this one has a sputter at highway speed and gets better if u ease up on the throttle. I check timing and it is at tdc pointing to #1 on the cap, no smoke, startd easy, nee cap/rotor. The plug wires are all firing with tan color plugs. And i couldn't find any vacumn leaks
Postmaster
Joined: Aug 2005
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From: Cleveland, TN
If you haven't yet you need to set the timing with a timing light!!! What you described is a rough setting to get it started...
It needs to be set at 10° BTC with the spout connector removed... And you can try for a little more power by going up to 12° or possibly as far as 14° if you don't have any trouble with pinging under acceleration or pulling a load.. If it pings back it back down a degree at a time until it stops pinging.
It needs to be set at 10° BTC with the spout connector removed... And you can try for a little more power by going up to 12° or possibly as far as 14° if you don't have any trouble with pinging under acceleration or pulling a load.. If it pings back it back down a degree at a time until it stops pinging.
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Tuned
Joined: Nov 2007
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i did all three on the code check. And I did notice that it seems to run alot better when it is cold compared to warmed up.
i did switch intakes and put mine on when i swapped motors to have the correct plenom abd checked for intake leaks too.
i did switch intakes and put mine on when i swapped motors to have the correct plenom abd checked for intake leaks too.
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Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
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You need about 20 miles of driving, essentially in city traffic with a small amount of highway traffic, once the engine is warm to allow the PCM to sort out the variances in inputs. Have you gotten that many miles of driving on it since the engine swap?
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Tuned
Joined: Nov 2007
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the old motor was leaking oil steadily on to the ground while running which is why I replaced it.
So far with the new motor, I have put about 100 miles on it around town and on the highway. The fuel filter was replaced back in september when the gast stations changed to the winter blends.
So far with the new motor, I have put about 100 miles on it around town and on the highway. The fuel filter was replaced back in september when the gast stations changed to the winter blends.
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Joined: Oct 2013
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Okay. Good.
The Engine Coolant Temperature, or ECT, sensor tells the engine when it can go into closed-loop mode. The Air Charge Temperature sensor, or ACT, Throttle Position Sensor, or TPS, Manifold Absolute Pressure sensor, or MAP, and Heated Oxygen Sensor, or HO2S, are inputs the Powertrain Control Module, or PCM, uses to determine how long to hold the injectors open. The Fuel Pressure Regulator, or FPR, ultimately determines how much fuel is injected by controlling the amount of fuel pressure present at the injectors.
I found out the 302 runs much better with ordinary plugs rather than platinum plugs after I put a set of high-buck platinum plugs in mine. What plugs do you have installed?
When you reconnected the MAP, did you use new vacuum hose? (I'm looking at eliminating a small vacuum leak, too small to upset the engine enough to cause it to throw a code but big enough to cause the engine to run badly.)
Did you use the ACT, FPR, and TPS from the old engine or the new one, or did you install new ones?
The Engine Coolant Temperature, or ECT, sensor tells the engine when it can go into closed-loop mode. The Air Charge Temperature sensor, or ACT, Throttle Position Sensor, or TPS, Manifold Absolute Pressure sensor, or MAP, and Heated Oxygen Sensor, or HO2S, are inputs the Powertrain Control Module, or PCM, uses to determine how long to hold the injectors open. The Fuel Pressure Regulator, or FPR, ultimately determines how much fuel is injected by controlling the amount of fuel pressure present at the injectors.
I found out the 302 runs much better with ordinary plugs rather than platinum plugs after I put a set of high-buck platinum plugs in mine. What plugs do you have installed?
When you reconnected the MAP, did you use new vacuum hose? (I'm looking at eliminating a small vacuum leak, too small to upset the engine enough to cause it to throw a code but big enough to cause the engine to run badly.)
Did you use the ACT, FPR, and TPS from the old engine or the new one, or did you install new ones?
Logistics Pro
Joined: Mar 2005
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From: Mexico, Missouri
Good suggestion broke vet!!!! I forgot that platinum plugs are being pushed off more on consumers as the new standard for plugs.
He's right about those platinums. If you have those, pull them out and put standard coppers in.
He's right about those platinums. If you have those, pull them out and put standard coppers in.
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Tuned
Joined: Nov 2007
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i used the new set of autolite plugs that were in the old motor as they were still like new. I did swap intakes so it does have a good tps, and prety good vacumn lines, as i replaced some as they were hard or brittle.