1998 ford f150 xlt 4.6 l back fires on start up rough idle wants to shut off replace IAT Mass airflow sensor Cam shaft sensor Crank shaft sensor installed new plugs still backfires rough idle and wants to die What could be the problem?
What is your question?
1998 Ford f150 4.6£ Back fires on start up rough idle have to give it throttle or it will die intermittently back firing Changed the IAT sensor Mass air flow sensor Camshaft sensor Crankshaft sensor installed new plugs still has the same problem What could be the problem?
What makes this problem better or worse?
Doesn't change for the better or worse
How long has your 1998 Ford F-150 had this problem?
Had to have new keys made and programmed that's when it started
2 Replies
mnmautorepairon Mar 11, 2020
check for code and fuel pressure test also stress the fuel pump by pinching the fuel return line for a second . The fuel pressure should be double normal pressure 55psi.
Similar Questions
See more 1998 Ford F-150 QuestionsWhat are the best Ford repair shops?
RepairPal Certified shops can diagnose and repair your 1998 Ford F-150. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Tuffy Tire & Auto Service Center - Grandview
1524 W 5th Ave
Columbus, OH
Closed
Opens 8:00 AM Tue
Excite Auto Repair & Towing
3430 Westerville Road
Columbus, OH
Closed
Opens 9:00 AM Tue
All In Auto Service
5200 Fisher Road
Columbus, OH
Closed
Opens 8:00 AM Tue
Tuffy Tire & Auto Service - Grove City
2131 Stringtown Rd
Grove City, OH
Closed
Opens 7:30 AM Tue
Blackstone Complete Auto Care
4800 Sinclair Road
Columbus, OH
Closed
Opens 9:00 AM Tue
Boyd's Tire & Service - Columbus
5263 Godown Rd
Columbus, OH
Closed
Opens 8:00 AM Tue
Tuffy Tire & Auto Service Center - Grandview
1524 W 5th Ave
Columbus, OH
Closed
Opens 8:00 AM Tue
Excite Auto Repair & Towing
3430 Westerville Road
Columbus, OH
Closed
Opens 9:00 AM Tue
All In Auto Service
5200 Fisher Road
Columbus, OH
Closed
Opens 8:00 AM Tue
Probably find YouTube video showing how - - Inadequate fuel pressure MAY be culprit. ⚠️ Easy to place plug wires in the WRONG firing order ⚠️ Google > 98 4.6 firing order. ♦️Don’t forget about the 2 ignition coil packs.!♦️ Hopefully you at least had codes read prior to parts replacement. Good luck!