smaring
Member
Hey guys,
I'm new to the forums here. I have a 2001 4.6L that I recently finished "refreshing" after a loud bang and smoke pouring out the exhaust like crazy. I figured I was lucky to make it in the driveway.
It had a broken timing chain guide and a valve that was a bit bent. I presume the later happened when the chain jumped what appeared to be a few sprocket teeth and got out of timing. That would certainly explain how terrible it was running before barely getting it home.
I gave it new head gaskets and bolts, a replacement valve, new valve seals, new valve springs, a few new rocker arms, new plenum gasket, new valve cover gaskets, new timing cover gasket, new timing chain guides and tensioners, new oil pump, new water pump, new oil adapter gasket, oil pressure sensor, new head temperature sensor, new thermostat, new egr valve and tube, new exhaust manifolds, new oil pan gasket, new transmission fluid filter, new air and oil filters, new spark plugs, a few new hoses, and a new idle air controller.
I WISH while I had the engine lifted a bit to get the oil pan out I would have replaced the engine mounts. It was a poor choice not to.
I cleaned up the top of the pistons, the heads, and lapped the valves. They were in pretty rough shape. I sprayed carb cleaner through the fuel injectors to ensure they were clean. I ensured the timing was proper for a Romeo.
After starting the engine it would still blow some white smoke for about 10 seconds and the idle after putting it in gear was pretty rough. My basic ODB scanner said the system was running lean.
I made a smoke machine and ensured there were no vacuum leaks. I did not test in the direction of the EVAP system. I then guessed at some possible reasons for the poor idle and smoke and I put in a new fuel pressure regulator, new fuel injectors, and a new mass airflow sensor. That seems to have helped the white smoke, but the idle is still a bit rough.
I got tired of throwing money at the wrong problem and picked up a Veepeak bluetooth ODB scanner.
The "FREEZE FRAME - FIRST OCCURRENCE" below was likely before I changed the fuel injectors, fuel regulator, and mass airflow sensor. The other two screens were taken at idle this morning. It is still idling pretty rough (too lean) and doesn't have much power to accelerate. I'll admit I'm a noob when it comes to understanding the significance of the O2 and fuel trim values.
Any opinions with regard to what this is telling me would be greatly appreciated. I would guess O2 sensors but my wallet is getting pretty tired of the guess-work that doesn't pan out.
Thanks,
Steve
Titusville, FL
I'm new to the forums here. I have a 2001 4.6L that I recently finished "refreshing" after a loud bang and smoke pouring out the exhaust like crazy. I figured I was lucky to make it in the driveway.
It had a broken timing chain guide and a valve that was a bit bent. I presume the later happened when the chain jumped what appeared to be a few sprocket teeth and got out of timing. That would certainly explain how terrible it was running before barely getting it home.
I gave it new head gaskets and bolts, a replacement valve, new valve seals, new valve springs, a few new rocker arms, new plenum gasket, new valve cover gaskets, new timing cover gasket, new timing chain guides and tensioners, new oil pump, new water pump, new oil adapter gasket, oil pressure sensor, new head temperature sensor, new thermostat, new egr valve and tube, new exhaust manifolds, new oil pan gasket, new transmission fluid filter, new air and oil filters, new spark plugs, a few new hoses, and a new idle air controller.
I WISH while I had the engine lifted a bit to get the oil pan out I would have replaced the engine mounts. It was a poor choice not to.
I cleaned up the top of the pistons, the heads, and lapped the valves. They were in pretty rough shape. I sprayed carb cleaner through the fuel injectors to ensure they were clean. I ensured the timing was proper for a Romeo.
After starting the engine it would still blow some white smoke for about 10 seconds and the idle after putting it in gear was pretty rough. My basic ODB scanner said the system was running lean.
I made a smoke machine and ensured there were no vacuum leaks. I did not test in the direction of the EVAP system. I then guessed at some possible reasons for the poor idle and smoke and I put in a new fuel pressure regulator, new fuel injectors, and a new mass airflow sensor. That seems to have helped the white smoke, but the idle is still a bit rough.
I got tired of throwing money at the wrong problem and picked up a Veepeak bluetooth ODB scanner.
The "FREEZE FRAME - FIRST OCCURRENCE" below was likely before I changed the fuel injectors, fuel regulator, and mass airflow sensor. The other two screens were taken at idle this morning. It is still idling pretty rough (too lean) and doesn't have much power to accelerate. I'll admit I'm a noob when it comes to understanding the significance of the O2 and fuel trim values.
Any opinions with regard to what this is telling me would be greatly appreciated. I would guess O2 sensors but my wallet is getting pretty tired of the guess-work that doesn't pan out.
Thanks,
Steve
Titusville, FL
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