Knock when acelerating

Tiny
MARIOC68
  • MEMBER
  • 1995 TOYOTA COROLLA
  • 120,000 MILES
Hello,
My car makes a knocking noise when accelerating. I have tried STP octane booster, but did not solve the problem.
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Saturday, July 9th, 2016 AT 5:20 PM

7 Replies

Tiny
HMAC300
  • EXPERT
Have a local mechanic take a look at this as it may be an internal engine problem requiring teardown due to something being seriously wrong. Make sure you oil is full.
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Sunday, July 10th, 2016 AT 8:52 AM
Tiny
MARIOC68
  • MEMBER
Hello.
Take a compression test on the engine, these are the results:
Cilinder 1: 220 psi
Cilinder 2: 216 psi
Cilinder 3: 220 psi
Cilinder 4: 220 psi
The nominal pressure for this motor (5A-FE) according to the workshop manual is 14, 0 kg / cm2=200 psi And the minimum of 10, 0 kg= 142 psi.
Could this 20 psi difference cause the spark knock?
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Monday, May 1st, 2017 AT 8:21 AM
Tiny
HMAC300
  • EXPERT
Not really compression numbers are good but timing cold be advanced to far as I dont' know where it is sitting whether it is where it's supposed to be or not. Also has anything been done to pistons like putting higher compression pistons in or shaving the head more than.030" as that can cause it to especially if you are running lower octane fuel.
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Monday, May 1st, 2017 AT 9:35 AM
Tiny
MARIOC68
  • MEMBER
I will try by adding octane booster.
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Monday, May 1st, 2017 AT 9:41 AM
Tiny
HMAC300
  • EXPERT
If you are using 87octane then just try going to 89 or 93 insead of that junk there are only a few on the market that work.
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Monday, May 1st, 2017 AT 9:48 AM
Tiny
MARIOC68
  • MEMBER
There is a probability that the combustion chamber must have char.
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Monday, May 1st, 2017 AT 10:27 AM
Tiny
HMAC300
  • EXPERT
I f you think that is the problem gm/ford dealers sell a top engine cleaner to put in engine to get rid of that.
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Monday, May 1st, 2017 AT 12:07 PM

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