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Shakes when stopped and in drive. Check engine light came on P1506 and P1504?

Tiny
AIDEN522
  • MEMBER
  • 1998 MAZDA 626
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 157,000 MILES
I have a 98 mazda 626 2.0L DOHC 4 cylinder that shakes when stopped and in drive. No check engine light came on. A scanner came up with this.

P1506
Idle air control system overspeed error
failed IAC valve

p1504
electrical load failure
cause:IAC circuit open or short circuit condition
failed IAC solenoid

I replaced the IAC valve as well as replaced all the spark plugs, wires and tested the ignition coil. IT still shakes bad when I turn the A/C on.
this is starting to drive me a little crazy.

I also have another question.I'm replacing the throttle positioning sensor. Does it have to be a particular kind or can I put a universal one on?What kind should I get for this car?

PLEASE HELP
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Friday, February 11th, 2011 AT 4:30 AM

4 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Did you clear codes and re test for codes again after repair?
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Friday, February 11th, 2011 AT 5:59 AM
Tiny
AIDEN522
  • MEMBER
  • 3 POSTS
Yes, and its still doing the same thing.I replaced the TPS today with no change. What would be the next thing that I should check?
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Sunday, February 13th, 2011 AT 12:23 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
It sounds like you might have low compression on one or more cylinders. This guide can help.

https://www.2carpros.com/articles/how-to-test-engine-compression

Please run down this guide and report back.

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Sunday, February 13th, 2011 AT 1:25 AM
Tiny
AIDEN522
  • MEMBER
  • 3 POSTS
Good call, #2 was at 80 psi, time for a valve job.
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Sunday, February 13th, 2011 AT 2:17 PM

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