I am having acceleration problems. My truck seems to not be
accelerating properly when from 0 - 35, it just seems sluggish. From
40+ if will sometimes shake if I'm not giving it enough gas and going
up hill is becoming more and more difficult.
This is a 1995 Ford F150 4.9 liter extended cab.
Any suggestions on what this might be would be helpful.
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Re: 1995 Ford F150 Acceleration Issues
I THINK THEY MAY HAVE DAMAGED THE PLUG WIRE BOOTS, TAKE A LOOK AT THEM AND SEE IF THE RUBBER BOOTS ARE TORN OR DAMAGED, CHEAP TUNE-UP SHOPS ARE FAMOUS FOR CAUSING THIS KIND OF DAMAGE, THERE IS A SPECIAL TOOL TO REMOVE THE WIRES WHICH GET STUCK TO THE PLUGS, MANY YOUNG KIDS DO THE WORK BUT DON'T EVEN KNOW THE TOOL EXISTS.
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Hello Bret. These codes are indicating engine misfires. 303 is cylinder #3 and 304 is cylinder #4. The 316 indicates that the misfire happened in the first 1000 revolutions. These trucks are notorious for misfires. The most common issue is ignition coil failure. Failure on these coils can be accelerated though by spark plugs that are worn and contamination from oils, antifreeze leaks and water. If it has been some time since you have replaced the spark plugs this may be an opportune time to do so. This job isn't for the faint of heart or those with little patience. Some of the coils and plugs are difficult to access, especially #7 and # 8. I also recommend torquing the spark plugs properly as there are some thread stripping issues on the spark plug threads with these engines. Have at least 2 new coil assembly's for the two cylinders that are misfiring and be prepared to find at least one more that looks poor. I have used some aftermarket coils but have had issues with them. Ford has reduced the price on their coils to reflect a more fair market value so I would use those. Have a look for any contamination issues and repair those to prevent future problems. Hope this helps you along.
Is the service engine light on? How many miles are on it? This is a common occurrence with plugged catalytic converters, will idle ok but no power on acceleration. It can also be a fuel delivery problem, filter clogged, bad pump... Many possibilities.
4.2 ltr missing. 2000 truck, f150. Changed plugs, wires. Ran great for 2 weeks. Started again. Changed coils. Got worse. Changed fuel filter, did nothing. Added injector cleaner and fuel cleaner, nothing. Checked EGR, o.k. It is getting worse. Had new gas about the time it all started.