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May 17, 2004 · 22 Posts
Discussion Starter · #1 ·
Jul 22, 2004 Lately I had been noticing a slightly rougher idle, which eventually developed into cylinder #5 consistently misfiring. I threw some injector cleaner in the tank and it seemed to clear it up for a few tanks. Yesterday the truck started running extremely rough and my Air/Fuel gauge was pegged at full-rich. The truck won't even idle and the exhaust was
making my eyes burn! The previously failing injector had obviously now completely failed and was stuck open; pouring fuel into the cylinder. I picked up a replacement injector this morning and did the job myself. I already knew what I was getting into, because I had to pull off the fuel rail when I replaced my cams. Tips: Dave Joined Mar 20, 2016 · 8 Posts
Hello Dave, This is a question regarding your mention of idle speed after replacing fuel injector. How did you know to start the engine several times before the engine would idle correctly? I ask because I recently replaced all of the fuel injectors in my 2002 Durango 4.7 engine and the idle is at 1400 and will not go lower. I did restart the engine 5 times
and will try more. However, no codes are shown and others suggest the computer have updated software installed. Do you have any comments to share on this? Joined Mar 20, 2016 · 8 Posts
Hello again, Dave, I started the engine over twelve times with the new injectors and the engine, a 4.7L in a 2002 Durango Sport 4WD, will not idle below 1400 RPM. The idle is steady. Do you have any other experience or suggestions which might help with case? Best regards, Leebar Joined May 23, 2016 · 1 Posts
Hello again, Dave, I started the engine over twelve times with the new injectors and the engine, a 4.7L in a 2002 Durango Sport 4WD, will not idle below 1400 RPM. The idle is steady. Do you have any other experience or suggestions which might help with case? Best regards, Leebar Hey not sure if you got this
figured out yet but I had a similar issue after re-assembling my 4.7 after re-conditioning and installing heads. Did you check for a vacuum/air leak? Mine was the hose waaay at the back of the throttle body area had either popped of or more likely I forgot to put back on. High idle sounds like air getting in where it shouldn't, injector would likely just cause a misfire if not functioning properly (too much or too little fuel per revolution, not changing RPMs so much). I'm not an expert by any
means, just sounds familiar to an issue I had. M How do I know if my fuel injectors need to be replaced?Here are a few signs there might be something wrong with your fuel injectors.. The Engine Misfires. Dirty fuel injectors may cause your vehicle's engine to misfire. ... . Idling Gets Rough. ... . Your Gas Mileage Tanks. ... . The RPM Needle Starts to Dance. ... . Your Car Won't Start.. Can you just change 1 fuel injector?Yes, you can replace just 1 fuel injector. Whether that's smart depends on the age of the car and the reason why you want to replace the one injector.
Is it better to clean or replace fuel injectors?Fuel injectors should be cleaned at least once every 36 months, or 45,000 miles. Replacing weak or worn-out engine parts without improving performance is not a good idea in general. However, cleaning out dirty injectors may gain a different perspective on engine health.
Do you need a tune when changing fuel injectors?Fuel injectors directly affect the fuel / air delivery of your vehicle. New fuel injectors do require a new or updated tune.
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