Small Surging and Rough Idle
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Joined: May 2020
Posts: 9
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Small Surging and Rough Idle
I have an 87 L98 with 33,000 miles. I’ve been having an intermittent issue where sometimes when I start it when cold and sometimes even starting it when it’s full operating temperature, my Service Engine Soon lamp comes on and I notice it surging and idling somewhat rough. It also will sort of “hunt” to stay on speed when I have the cruise set. This only happens intermittently. When the SES lamp is off, the car runs, idles and drives excellent. About a month ago, I installed a performance air filter (K & N) type it utilizes a pre-oiled cotton material. I’m wondering if possibly the oil may have affected the TPS or throttle body plates, I don’t know. That may be a stretch. Anybody else ever have this issue? It’s not a real big deal, but it keeps the car from running pretty much flawlessly.
Team Owner
Joined: Jul 2004
Posts: 28,430
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From: Hartford WI
I have an 87 L98 with 33,000 miles. I’ve been having an intermittent issue where sometimes when I start it when cold and sometimes even starting it when it’s full operating temperature, my Service Engine Soon lamp comes on and I notice it surging and idling somewhat rough. It also will sort of “hunt” to stay on speed when I have the cruise set. This only happens intermittently. When the SES lamp is off, the car runs, idles and drives excellent. About a month ago, I installed a performance air filter (K & N) type it utilizes a pre-oiled cotton material. I’m wondering if possibly the oil may have affected the TPS or throttle body plates, I don’t know. That may be a stretch. Anybody else ever have this issue? It’s not a real big deal, but it keeps the car from running pretty much flawlessly.
