Question about 1994 Oldsmobile Silhouette

2 Answers

Does not accelerate

When driving my van, sometimes I can feel it becoming sluggish, and it does not accelerate when I step on the gas. Then the "Service Engine Soon" light comes on. Then the van starts to limp for a while, and then sometimes, it acts normal for a bit, while the "Service Engine Light" is on. I took it to the mechanic when the light was on, they put on the scanner and the following codes appeared: 670 QDM 4 failure 650 QDM 2 failure 640 QDM 1 failure Please tell me : 1) if I need to have a part replaced 2) how much would the part cost 3) how long does it take to install the part 4) should I have a dealership fix it; or a mechanic at a small shop.

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  • Sstaci600 Jul 21, 2008

    My husband has the same issues with his 1994 Silhouette but when they did the diagnostics, no codes appeared.Since it failed E-check he replaced the spark plugs and had it re-checked. Although the HC and CO readings dropped considerably, it still failed. He contacted his mechanic who suggested that he replace the MAF Sensor, which he just did. He is going to E-check again today and hopefully, it passes.

    Since replacing the plugs and MAF Sensor the van does seem to be driving somewhat better in terms of the acceleration and the check engine light has not come back on, but it is still lagging when first driven.

    Any suggestions??



2 Answers

Have the mechanics check the throttle position sensor. Mine did this from the day I bought it and the fix was a $140 plastic piece (the throttle position sensor) which tells the computer how much gas and air to mix in the combustion chambers

Posted on Sep 27, 2008

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  • 291 Answers

These are quad driver codes.... The drivers are part of the computer and it is rare for the computer to blame itself... Have the system checked again for stored codes and diagnose the system indicated properly by who ever you feel most comfortable with.

Posted on May 15, 2008


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