Codes 21 and 28

Tiny
PIPOYEYE56
  • 1992 TOYOTA CAMRY

It have a littlel chaking and somentime shutoff

Do you
have the same problem?
Yes
No
Sunday, April 14th, 2013 AT 11:05 AM

2 Replies

Tiny
RANDICO
  • MEMBER

Code 21 and 28, these are oxygen sensor signal, They are not the cause of the problem with the shaking going on but the result of the shaking, In other word you have a lean misfire, start of with a inspection, do a visual, any vacuum lines disconnected that will cause low RPM, that you are facing, RPM at idle should be 750 to 800 RPM. Look at the MAF (where the airfilter is) there is a intake air duct these have tendency to crack or rip, so look for that If its torn or rip that the problem and new air duct is the solution, If all is fine you will need to go with a tune up, the reason is sparkplug wire can cause misfire that leads to the shaking, a distributor cap and rotor, especially the coil, that needs to be inspected it has a tendency to crack across the exposy giving low power

Was this
answer
helpful?
Yes
No
Sunday, April 14th, 2013 AT 12:52 PM
Tiny
ASEMASTER6371
  • EXPERT
  • 25,554 POSTS

Great answer but I would start with a compression test due to the age of the vehicle

Roy

Was this
answer
helpful?
Yes
No
Monday, April 15th, 2013 AT 2:03 AM

Please login or register to post a reply.

Other OBD1 Code 21 Questions