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

asked by on

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
  1. Home
  2. Questions
  3. Rough idle, clacking noise from engine under higher load

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

Q: Vibration in car.

The most likely problem you are describing is the front brake rotors are warped. The rotors would need to be replaced with the brake pads at the same time. I would recommend the brakes and front end be checked first...

Q: New coils plugs and wire plugs now car starts and stalls out within 3 seconds.

I would recommend retracing your steps on this. It is possible that an electrical connector or a vacuum hose of some kind could have been disconnected and not put back during the replacement of the spark plugs and ignition coils....

Q: Q: How do I remove the cylinder head?

The cylinder head bolts on this engine are tightened to 65 ftlb or 88 nm. Over time the bolts that go into the cooling system passages may have corroded in the holes. You should use a large breaker bar and...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...