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: Transmission won't go into reverse after clutch replacement

Hello. If your vehicle is no longer going into gear after a clutch service, it may be possible that an issue occurred while the service was being done. Perhaps a problem with the clutch fork, or hydraulic clutch mechanism that...

Q: Control arm bushing replacement

The service that you are referring to, namely control arm assembly replacement includes the bushings. That control arm has two bushings in it, already pre-installed in the control arm. So, the price is "complete". If you want this service performed...

Q: Burning smell from inside the cab?

Sounds like you have a handful of things to deal with. But as for the burning smell; if it is coming from the vents when the heat is on, it could be that you have a blower resistor overheating. The...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...