Rough start
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Member
Joined: Apr 2015
Posts: 48
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From: San Diego
Rough start
Hello,
I’m new in F150 forum, as I just recently bought a 1997 base (it has crank windows!!) 4.2l V6 F150 with 135k miles, service history in not known.
What I have done so far is changed oil - M1 extended performance 5w-20, used motorcraft filter. Replaced the rear differential oil (found evidence that it was replaced at least one time, as I found a gasket). In hot there is a slight ticking noise at idle. I haven’t noticed it prior oil change.
There is an oil leak which appears to be a rear main seal. There is a leak at the front main seals as well.
So here is my question:
At start up the engine start very rough. It is only after a longer stop (day or so). With hot start it starts ok. By rough start I mean the engine tumbles and rocks, almost stalls than it catches and the idle smooth out.
Otherwise the engine idles ok, with a slight tick when hot.
On my to do list is new plugs.
Any pointers are welcome.
Thanks
I’m new in F150 forum, as I just recently bought a 1997 base (it has crank windows!!) 4.2l V6 F150 with 135k miles, service history in not known.
What I have done so far is changed oil - M1 extended performance 5w-20, used motorcraft filter. Replaced the rear differential oil (found evidence that it was replaced at least one time, as I found a gasket). In hot there is a slight ticking noise at idle. I haven’t noticed it prior oil change.
There is an oil leak which appears to be a rear main seal. There is a leak at the front main seals as well.
So here is my question:
At start up the engine start very rough. It is only after a longer stop (day or so). With hot start it starts ok. By rough start I mean the engine tumbles and rocks, almost stalls than it catches and the idle smooth out.
Otherwise the engine idles ok, with a slight tick when hot.
On my to do list is new plugs.
Any pointers are welcome.
Thanks
Last edited by bzoli; May 4, 2015 at 01:34 AM.
Thread Starter
Member
Joined: Apr 2015
Posts: 48
Likes: 0
From: San Diego
Thread Starter
Member
Joined: Apr 2015
Posts: 48
Likes: 0
From: San Diego
Thread Starter
Member
Joined: Apr 2015
Posts: 48
Likes: 0
From: San Diego
Just a quick update - I did replaced the spark plugs and wires (used AGSF42FM plugs, and WR5702 wire kit from motorcraft ). I removed autolite sparks (which is good, means a previous owner cared enough to replace those).
I noticed two interesting things:
1 - the gaps were not even. There were plugs had larger opening
2- driver side rear cylinder showed oil on the thread and on the tip and it was not burned out properly. I might have a leaky valve stem seal.
I little regret not having a compressor end pressure check - but what decision would I make based on the results? As long as it works (means hauls cargo) it won’t touch the engine.
After the change the startup roughness / tumbling /almost stalling went away completely.
I noticed two interesting things:
1 - the gaps were not even. There were plugs had larger opening
2- driver side rear cylinder showed oil on the thread and on the tip and it was not burned out properly. I might have a leaky valve stem seal.
I little regret not having a compressor end pressure check - but what decision would I make based on the results? As long as it works (means hauls cargo) it won’t touch the engine.
After the change the startup roughness / tumbling /almost stalling went away completely.