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1995 Olds Silhouette misfiring
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tcastrodad
New User
Jun 27, 2009, 4:39 AM
Post #1 of 5
(1814 views)
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1995 Olds Silhouette misfiring
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1995
Oldsmobile
Silhouette
3.8l
160k miles
I've owned this vehicle for 5 years now and bought it with 90k miles. There iss an issue going on that I have yet to resolve. Occasionally the engine will misfire, especially going up hill and changing gears (automatic) I've replaced the fuel filter, the spark plugs, the O2 sensor, plug wires, air filter, used injector cleaner, put on new vacuum lines and the computer was replaced due to another issue. This misfire gets worse as the ambient air temperature goes up, the engine temperature makes no difference. There are times when it's 90+ degrees out that it gets so bad it hardly runs. Through all of this, I have yet to see my check engine light come on, ever.
Anyone have any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 27, 2009, 6:15 AM
Post #2 of 5
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Re: 1995 Olds Silhouette misfiring
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If your sure that it's an ignition misfire, then it's likely a bad coil, possibly an ignition module but the coil is more likely. If you can determine which cylinder is doing it, then you can swap coils with another cylinder to see if the miss moves to the other cylinder.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tcastrodad
New User
Jun 27, 2009, 6:48 AM
Post #3 of 5
(1801 views)
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Re: 1995 Olds Silhouette misfiring
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I'm not sure if it's ignition or not, and am not ruling ANYTHING out, including vapor lock, water in the gas or a bad coil as you mentioned. Since the ordinary service items have already been replaced, I'm looking to not have to spend money on parts that MIGHT fix the problem.
Back in the day when I used to be able to work on my own car, I'd be looking into the carburetor first, then then cap and points. But alas, those days have long since passed... Heck we even had to undo the motor mounts and tip the whole engine forward to replace 3 spark plugs on this thing!
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 27, 2009, 6:51 AM
Post #4 of 5
(1796 views)
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Re: 1995 Olds Silhouette misfiring
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Well, you can rule out vapor lock because that's not possible.
Your not going to get any magic answer without doing some testing yourself. You'll have to use a spark tester and power brake the engine to try to induce the problem and determine which cylinder is doing it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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tcastrodad
New User
Jun 27, 2009, 6:55 AM
Post #5 of 5
(1790 views)
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Re: 1995 Olds Silhouette misfiring
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Thanks for the quick reply! I'll give that a shot. As to troubleshooting, I'm not well enough schooled on working on cars these days. Matter of fact, other than oil changes, grease jobs and plugs and wires, I've done little of my own work.
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