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178 Posts
2018 Cruze diesel, RS hatchback. 6spd manual.
As the title states, my MAP sensor was plugged solid. For a while I’ve been experiencing
1.) Deteriorating fuel economy (nothing drastic but enough to notice).
2.) Feels sluggish. Doesn’t have that pep that it had when new.
3.) Upon cold start the car hiccups VERY badly for 2 mins before clearing up. The “hiccup” never, ever, occurs with the RPM’s above exactly 2000 rpm
I took the engine cover off and this helped make room to reveal the MAP sensor. I forget the size of the screw in there but it was a torx.
I removed the sensor and sprayed it down with WD40 and picked out the tar and carbon, which was much harder in texture than I imagined. I don’t have a photo of the “after”.
I reinstalled the sensor, started the car, and the car ran terribly for 30 seconds. It cleared right up after that. I took the car out for a long drive and I can say with absolute certainty that this made a noticeable difference in acceleration and pedal response. Big difference. We’ll see how MPG plays out. I’ve got 50,000 miles.
I can’t comment on the cold start hiccup just yet because I need to let the car sit overnight but I figured I would pass this info along and urge others to carefully inspect their MAP sensor. It’s easy to get to and cleaning it was not difficult.
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As the title states, my MAP sensor was plugged solid. For a while I’ve been experiencing
1.) Deteriorating fuel economy (nothing drastic but enough to notice).
2.) Feels sluggish. Doesn’t have that pep that it had when new.
3.) Upon cold start the car hiccups VERY badly for 2 mins before clearing up. The “hiccup” never, ever, occurs with the RPM’s above exactly 2000 rpm
I took the engine cover off and this helped make room to reveal the MAP sensor. I forget the size of the screw in there but it was a torx.
I removed the sensor and sprayed it down with WD40 and picked out the tar and carbon, which was much harder in texture than I imagined. I don’t have a photo of the “after”.
I reinstalled the sensor, started the car, and the car ran terribly for 30 seconds. It cleared right up after that. I took the car out for a long drive and I can say with absolute certainty that this made a noticeable difference in acceleration and pedal response. Big difference. We’ll see how MPG plays out. I’ve got 50,000 miles.
I can’t comment on the cold start hiccup just yet because I need to let the car sit overnight but I figured I would pass this info along and urge others to carefully inspect their MAP sensor. It’s easy to get to and cleaning it was not difficult.
