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Author Topic: Badly Shaking 1998 5 litre?  (Read 2471 times)
Cold Aussie
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« on: January 12, 2016, 12:22:36 am »

Hi all
Happy NewYear!
my son has just purchased a 1998 Australian AU Fairmont Ghia 5 litre. It shakes badly at idle and at low revs. Mounts are fine. It runs on eight, I have checked and replaced the plugs. I sure that the leads and coil packs are OK as the plugs look great after a couple hundred mile.
Apparently the shake started when the previos owner replaced the exhaust system. Is it possible that a damaged or incorrect O2 sensor couls cause a bad shake?
Regards
Stephen
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Haystack
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« Reply #1 on: January 12, 2016, 01:01:44 am »

What do the codes say? I'm unsure of when Australia did the switch to oobd2...

I'd guess maf or map/bap sensor with no knowledge of what's wrong. I'd run codes and check vacuum lines or check sensors.
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« Reply #2 on: January 12, 2016, 01:24:57 am »

That car has the EEC-V. It's a 235hp 302.  Did they mess with the balancer on the front of the engine at all? Maybe installed underwrite pulleys? It seems odd if it was missing bad enough to cause a shake,  that the spark plugs still look good.

As he said, pull the codes first and see what it's thinking.
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Haystack
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« Reply #3 on: January 12, 2016, 01:32:19 am »

If you've ever had a bad/disconnected map sensor, the car won't idle and will buck like crazy. While driving it will behave normally but get bad gas mileage.

When my map sensor died I couldn't even keep it running until 2k rpm's when cold, but once warmed up it drove fine and still got average MPG.
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1987 Ford thunderbird. sn-95 t-5, f-150 clutch and flywheel behind a 5.0 s.o. weighs about 3500lbs.
1986 cougar gs. 5.0 s.o. and aod.
SlickTang
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« Reply #4 on: January 12, 2016, 06:50:48 am »

If you've ever had a bad/disconnected map sensor, the car won't idle and will buck like crazy. While driving it will behave normally but get bad gas mileage.

When my map sensor died I couldn't even keep it running until 2k rpm's when cold, but once warmed up it drove fine and still got average MPG.

I had map sensor trouble on a Ranger once. The vacuum line wore a hole in it and it kept filling the oil full of gas. Map sensors are tricky Devils.  When I unplug the maf my car always dies all together, but that could be due to the cam, so I didn't think about that.  But wouldn't bad mileage mean it'd be running rich and have black plugs?

I've ran mine without the h pipe, but I can't remember if it bucked at idle. The 02 sensors shouldn't affect it when it's in closed loop mode though.
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Joel5.0
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« Reply #5 on: January 13, 2016, 05:48:38 am »

Make sure the O2 sensors are connected to the correct harness connector.  Bank 1 O2-to-bank 1 connector and bank 2 O2-to-bank 2 connector. LUK
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