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1996 Honda Accord EGR troubl codes

Tiny
RJG71
  • MEMBER
  • 1996 HONDA ACCORD
Engine Performance problem
1996 Honda Accord 4 cyl Front Wheel Drive Automatic 189 k miles

Original problem was p0401 code, was told to clean ports on intake. This was after checking control selinoid and no vaccum at egr. When applied vaccum to egr engine would not stall and vaccum held. After cleaning ports cranked engine and idled fine but when you accelerate and after deceleration engine stalls. So I capped vaccum from selinoid to egr and engine idles and does not stall any more. Currently driving with out any issues othr than engine light on. But now have trouble code p1491 or 12 trouble code wich leads to vavle lift sensor. Is this becuse of the vaccum line being removed or could it be the VLS, and is there a method to test before I start part changing.
Thanks in advance
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Tuesday, October 19th, 2010 AT 1:22 PM

5 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi rjg71,

P0401 = EGR insufficient flow detected.
Cleaning the EGR valve and port under it and manifold is the correct thing to do.

P1491 = EGR valve lift insufficient detected.
When vacuum lines are blocked, the code would be triggerred.
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Thursday, October 21st, 2010 AT 10:39 AM
Tiny
RJG71
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Thanks KHLow2008

The problem now is car stalls at decelleration and when rpms are raised and engine returns to idle. Checked for vaccum at egr and it jumps to 8 when rpms are raised and holds when engine returns to idle. Is it normal for vaccum to jump at certian rpm and should vaccum release as engine returns to idle? If this is not normal what is most likely the cause?
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Thursday, October 21st, 2010 AT 11:59 AM
Tiny
KHLOW2008
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Vacuum would fluctuate with throttle opening and engine rpm.

Vacuum should release when the solenoid is not working.

If the EGR solenoid vacuum hoses were disconnected, recheck if they had been reversely installed. Vacuum hose from engine should be attached to the outer port. If they had been reversely installed, vacuum would not be released when the solenoid stops working.
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Thursday, October 21st, 2010 AT 12:07 PM
Tiny
RJG71
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Thanks KHLow,

Reversed vaccum lines at soleniod and engine does not stall, so far so good.

Thanks a million
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Friday, October 22nd, 2010 AT 6:23 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
You're welcome.

Glad to know you have fixed the problem.

Have a nice day
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Friday, October 22nd, 2010 AT 8:41 AM

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