 weird high idle with nearly empty tank |
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| dax1969 |
 Mar 3 2023, 07:42 AM
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#1
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Member  Group: Members Posts: 387 Joined: 10-March 14 From: belgium Member No.: 17,103 Region Association: None 
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Hi,
I have a 74 2.0 FI and car idles, after warming up, at a normal 850/900 rpm Yesterday however I had something weird ... In the morning (really cold outside) everything was normal (higher idle on start up, normal idle when warmed up) but on the way back the idle remained at 1200 rpm. I immediately thought vacuumleak. I needed gas as I was running very very low on fuel (warning light came on, never saw it before (IMG:style_emoticons/default/biggrin.gif) ) ... fyi, my tank is shiny and clean as I cleaned and coated the tank last year. After filling up the idle went back to normal... Drove the car again next day, same...all normal. Can low on fuel cause a higher idle ? weird cheers Dax |
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| ejm |
Mar 3 2023, 05:05 PM
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#2
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I can see the light at the end of the tunnel Group: Members Posts: 2,707 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
Most likely you had icing in the throttle body which forms when cruising and keeps the throttle from closing all the way. When you stopped for gas heat from the engine melted it. If you were pulling a vacuum on the tank you would probably have noticed something when you removed the cap. The very early 1.7 had intake air preheating but the system was dropped on 914's although other applications of the type 4 engine retained it.
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Posts in this topic
dax1969 weird high idle with nearly empty tank Mar 3 2023, 07:42 AM
Lockwodo I wouldn't think so, more likely a coincidence... Mar 3 2023, 09:08 AM Superhawk996 A theory:
An empty tank contains much more fuel... Mar 3 2023, 09:23 AM ChrisFoley There's a little partially crimped vent tube i... Mar 3 2023, 09:49 AM emerygt350 I agree with Chris, it could be a lean condition f... Mar 3 2023, 10:40 AM 76-914 AFAIK that is normal. While I've had my '7... Mar 3 2023, 10:44 AM emerygt350 That is really interesting! Now I have an exc... Mar 3 2023, 02:41 PM Lockwodo ..and a reason to keep a few gallons of gas in the... Mar 3 2023, 03:42 PM wonkipop just shows that a 914 can actually empty its tank ... Mar 3 2023, 05:02 PM
dax1969 Thank you all for the feedback... I'll keep an... Mar 7 2023, 04:54 AM |
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