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| check engine light at higway speed 87 gt (Page 1/1) |
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domer94
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NOV 08, 04:31 PM
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ive replaced gas cap , checked every line imaginable. i can drive the back roads all day with no light. once on the higway above 70 i get it. once the car is off and back in the garage , i have no light when i take it out again
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Patrick
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NOV 08, 07:00 PM
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And... the stored code is... ?
I'll go out on a limb and suggest it's got to do with a malfunctioning EGR solenoid.
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Raydar
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NOV 09, 02:57 PM
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| quote | Originally posted by Patrick:
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I'll go out on a limb and suggest it's got to do with a malfunctioning EGR solenoid. |
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My thought as well.
To expand on the EGR solenoid thought, also check for vacuum leaks (which turned out to be one of my problems).
There are two barbs on the bottom of the throttle body. The EGR is the smaller of the two. It uses a 90 degree rubber fitting that the hard plastic vacuum line plugs into. From there, the line goes to the EGR solenoid, and then back to the EGR valve. ANY of those lines - or terminations - can cause a vacuum leak. Most of those fittings are at least 35 years old by now, and many have deteriorated.
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domer94
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NOV 11, 12:39 PM
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thanks will check those egr lines. i havent pulled codes yet... i saw some way on youtube to jump some connector locations on the ecm and get the blinking codes.. just havent done it yet
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Vintage-Nut
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NOV 11, 01:39 PM
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Patrick
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NOV 11, 03:06 PM
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| quote | Originally posted by domer94:
i havent pulled codes yet... i saw some way on youtube to jump some connector locations on the ecm and get the blinking codes...
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Did you click on my link? The info there and a reconfigured paper clip will tell you all you need to know.
| quote | Originally posted by Patrick:
And... the stored code is... ?
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Raydar
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NOV 13, 12:48 AM
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This picture shows the "conventional" mounting - which is usually under the dash, in most cars.
In the Fiero, the ALDL connector is mounted upside down, on top of the console skeleton (next to the cigarette lighter, behind the black panel.) The A and B pins are the two nearest the passenger side of the car, on the bottom row.
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Vintage-Nut
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NOV 13, 07:27 AM
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Yes, that is true...
SO, member Romsk created the 'correct' image for the Fiero ALDL...
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Patrick
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NOV 13, 12:58 PM
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The two terminals to be jumpered, A and B, are the only two terminals of the ALDL port side by side that have metal contacts within them. The metal contacts are easily seen, therefore identifying where the jumper goes really isn't that big of a deal.
 [This message has been edited by Patrick (edited 11-13-2025).]
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