4.6 trouble
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Joined: Jun 2002
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4.6 trouble
[updated:LAST EDITED ON 04-Jun-02 AT 06:35 PM (EST)]I have a '98 F-150 Ext Cab W/ 4.6, with 80,000 miles.It will not idle when cold. It also rough idles in drive sometimes. There is no pattern to the rough idle. I have also noticed that the valves knock under acceleration and at 70-75 mph. I have changed all the filters and had the injectors cleaned. Occasionaly it puffs a little blue smoke on start up. Is it the valve seats? HELP!
Senior User
Joined: Apr 2002
Posts: 467
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From: On the farm near Loveland
4.6 trouble
Just a wild guess since you're there and I'm here but sounds like a vacuum leak causing the bad idle, the pinging could be an EGR problem, so maybe it's a vacuum leak in the EGR system.
If they're in your area head for an Auto Zone store, they'll give you a free reading of any error codes stored in your ECU.
Good luck.
-Bill in Colorado
1996 Ex/Cab F-250 4x2 Long bed 460
E4OD auto, 10.25" 4.10 Stirling posi, Air-Lift suspension,
homebrew cold-air intake w/K&N filter, modified ignition
advance curve, Edelbrock 2x61 mm throttle body, Bosch Platinum +2 plugs,
Champion truck plug wires, L&L long tube headers,
3" exhaust system, cat & Flowmaster 70, modified MAF
meter, Michelin LTX 265/75/16E, Mobil 1 10W-30, Red Line
D4 ATF, Red Line 80W-90 in axle. Reese hitch.
10 to 12.8 MPG, 5,700 lbs.
{E\....F}
If they're in your area head for an Auto Zone store, they'll give you a free reading of any error codes stored in your ECU.
Good luck.
-Bill in Colorado
1996 Ex/Cab F-250 4x2 Long bed 460
E4OD auto, 10.25" 4.10 Stirling posi, Air-Lift suspension,
homebrew cold-air intake w/K&N filter, modified ignition
advance curve, Edelbrock 2x61 mm throttle body, Bosch Platinum +2 plugs,
Champion truck plug wires, L&L long tube headers,
3" exhaust system, cat & Flowmaster 70, modified MAF
meter, Michelin LTX 265/75/16E, Mobil 1 10W-30, Red Line
D4 ATF, Red Line 80W-90 in axle. Reese hitch.
10 to 12.8 MPG, 5,700 lbs.
{E\....F}
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