At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
Re: A light but audible tapping under the hood that...
Sounds like something in the valvetrain, a lifter or rocker arm. Could be from lower oil. Is it a metallic sound? Is the noise coming from a certain area of the motor?
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
it sounds like there is no fuel getting to intake.
when you step down on accelerator, it is designed to squirt a shot of fuel into the intake, which would keep it running for a few seconds. same as pouring gas down intake.
you never stated if you had carburation or injection system, in either case no fuel is getting through on its own.
which could be a variety of problems depending on which system you had.
When you accelerate the engine it rocks a bit under the hood. A loose/internally broken ground wire/cable under the hood is a possibility. Look for any and all wires/cables under the hood that might be loose. Wiggle all of these wires and don't forget any ground wires coming off the negative battery post. There are, I believe, ground wires at different areas under the hood. You might find your problem with one of these ground wires. The other possibility is at idle not a ton of charge is being generated from the charging system. Above idle an over charging voltage regulator can be the problem. It may be integrated into the PCM or be part of the alternator. A voltage charge test will reveal this. So, there are two possible sources of malfunction. Best of luck. And don't give up, you'll figure it out.
The plug wires on this model year and prone to burn through, replace them all, do one at a time and always put them back in the factory wire looms they run through, that is very important, replace any you may break. Use high qyuailty oplug wuires foractory parts are preferred..
sounds as if the accelerater cable broke, when you were able to throttle under the hood did you happen to notice if the accelerater cable was moving freely.
Replace the egr, or if you want to be sure, have a friend give it gas ( unless you are familiar with the throttle body) while you listen under the hood. You should be looking between the firewall an engine. Once you locate it, you will know if your tapping is coming from the egr. Could be that something is touching a fan, or even the cv joint (would get worse during turns). Best bet, get under the hood and check it out. If the egr code is coming up, it needs to be replaced.
Don't do this with your truck in gear but if you can get the engine to drop down closer to a normal idle by tapping the accelerator pedal, it is probably just a case of dry linkage under the hood.
Use a lubricating spray (no WD-40, it evaporates) on the linkage you see moving when the accelerator pedal is moved.
A weak return spring can cause this too but is a less common problem.
Your noise sounds like it is power train related,If you have eliminated the engine,Since it doesn't make the noise while moving and in neutral. It sounds like a universal joint in the drive shaft.Do you notice a vibration along with the noise?
×