Diagnosis steps & tools?

Darryl Snover dsnover at fast.net
Mon Feb 8 20:48:15 GMT 1999


I had a similar problem with my 87 Fiero, turned out to be a sticky IAC
valve.  Not sure if the 3.1 has the same type of idle control, but .......


Best,

Darryl



>I have a '90 Chevy Beretta with the 3.1L V6 that I'm looking for some
>diagnostic suggestions.  Basically when the engine is warmed up, it hunts
>for an idle.  It never stalls but it sounds like it's misfiring.  I'm in
>the process of figuring out which scantool to get so I took it to the
>shop.  Mr. Goodwrench ran some diagnostics and said everything was fine.
>I took the service advisor out for a spin and showed him what it was
>doing.  His reply was that this is something that is designed in.
>
>The biggest problem is I'm now getting close to failing idle emissions
>tests so I figure this isn't really a "designed in" idle hunt.  Rather
>than chase it with parts, I'm looking for any suggestions on where/what
>tools to get so that maybe I can see what's going on.
>
>I don't know which scantool is adequate.  I was looking at either the Auto
>Xray or the Actron Scantool.  The others I saw were thousands of dollars.
>Not knowing what a "Mr Goodwrench Diagnostic" consists of, I wonder if any
>of those hobby scantools would tell me anything.
>
>I also looked at the Diacom but I always get ten-year-old brochures when I
>contact them for info.
>
>I've been toying around with EFI for a little while, so I figure this will
>really get my feet wet!
>
>Thanks,
>
>Terrill







More information about the Diy_efi mailing list