Q: Rough idle, clacking noise from engine under higher load

asked by on October 28, 2016

i myself am a mechanic at a reputable repair facility, though my stronger suits are the import 4 bangers, ive been working on euros more often than not....enough enough......1993 tercel with the EFI 1.5l 3E-E..car arrived running, customer complains vehicle would not accelerate over 30-40 MPH...did typical tests, compression was a little low, 100PSI across the four..installed new plugs, checked for vacuum leaks, none found...vehicle would start and idle for about 30 seconds then idle would surge up and down...cleaned IAC, seemed to help surge issue...test drove and vehicle ran fine.....vehicle slept in shop stall last evening...ok so , today...vehicle was a no start and after draining gas tank, fresh gas and cleaning plugs multiple times,,car will start and idle, but idle is so low vehicle seems to want to stall...oh and did i mention jumping pins TE1 and E1, no codes retrievable....?

My car has 120620 miles.
My car has a manual transmission.

Hi there. From the description you have provided, the vehicle you are working on needs further diagnoses. First, 100 PSI for cylinder compression is inadequate. I would look into whether valve timing is correct. An incorrectly timed camshaft could cause low cylinder compression across the board and may account for the clacking noise.

Improperly adjusted valves could also create the same condition. As part of your description, you stated, after doing some repairs the vehicle ran fine. This is somewhat confusing. If the exhaust is restricted, (e.g. from a partially plugged catalytic converter) that should of been felt on the road test. The next day, the vehicle being a no start would lead me to check fuel pressure and for spark. Ignition timing could also be improperly set. If you find yourself unable to locate the area of fault. I recommend having the vehicle’s lack of power diagnosed by a certified technician, such as one from YourMechanic.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Having squeaks when driving over bumps and pot holes

There are a lot of different suspension components that can make the noise you are hearing and here is some of them to check: front and rear sway bar bushings and link arms. Shocks and shock bushings, front track bar...

I hit a curb and now the tire is slanted. How much to repair?

Depending on what kind of damage was done will determine how much it may cost to repair the damage. Depending on how hard the vehicle hit the curb, it could have damaged an axle shaft or wheel hub, which may...

Running rough 2002 Ford Focus

Hi - rough running can be caused by a number of things: misfiring, dirty throttle body, injectors, fuel filter, idle air control valve and so on. There was a technical service bulletin from Ford for this engine which pointed to...

Related articles

2012 Toyota Prius vs. 2012 Chevrolet Volt: Which One Should I Buy?
While these two vehicles are both certainly cost-effective to drive, they can be difficult to compare due to the Prius’ entry in the mid-size category and the Volt living squarely in the compact car category. Both of these vehicles are...
The Importance of Warming Your Car Before Driving
Scandphoto / Shutterstock.com Many people feel that it’s important to warm a vehicle up before driving off. This has long been the dominant school of thought, dating from when cars had carburetors and many would not run...
The Best Used Cars to Buy If You're a Farmer
If If you're a farmer, you know that what you need isn’t a used car – it’s a used pickup truck. How else are you going to haul around hay, implements, garden produce, fertilizer, and all the other things you...