 74 914 1.8 engine bogging down, Engine loses power after warm during acceleration |
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| SteelerMike77 |
  Apr 5 2019, 10:53 AM
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#1
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Newbie  Group: Members Posts: 24 Joined: 12-February 19 From: Mountville, Pa Member No.: 22,874 Region Association: MidAtlantic Region  |
Hi all,
Just wondering - any thoughts about why my 1.8, twin carbs, 1974, 914 after warming up the engine will lose power during acceleration, sputter, and cough! (IMG:style_emoticons/default/WTF.gif) I did notice the oil temp was pretty high - not all the way up. Once the car sits little its fine! I am changing oil this weekend, any other ideas??? Thanks |
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| Big Len |
Apr 6 2019, 04:55 AM
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#2
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Senior Member Group: Members Posts: 1,747 Joined: 16-July 13 From: Edgewood, New Mexico Member No.: 16,126 Region Association: Southwest Region |
Sounds like a fuel issue. Carbs or FI? Start simple 1st - When was the last time the fuel filter was changed?
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| dr914@autoatlanta.com |
Apr 6 2019, 09:40 AM
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#3
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914 Guru Group: Members Posts: 7,864 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
I would first check dwell and timing and make sure that your valves are in adjustment, then check air flow on the carbs and make sure that it is idling on all four
QUOTE(SteelerMike77 @ Apr 5 2019, 09:53 AM)  Hi all, Just wondering - any thoughts about why my 1.8, twin carbs, 1974, 914 after warming up the engine will lose power during acceleration, sputter, and cough! (IMG:style_emoticons/default/WTF.gif) I did notice the oil temp was pretty high - not all the way up. Once the car sits little its fine! I am changing oil this weekend, any other ideas??? Thanks |
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| porschetub |
Apr 6 2019, 01:47 PM
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#4
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Advanced Member Group: Members Posts: 4,699 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Sounds like a "lean" condition,whats the idle like ?.
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| SteelerMike77 |
Apr 7 2019, 05:25 AM
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#5
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Newbie Group: Members Posts: 24 Joined: 12-February 19 From: Mountville, Pa Member No.: 22,874 Region Association: MidAtlantic Region |
QUOTE(Big Len @ Apr 6 2019, 06:55 AM) Sounds like a fuel issue. Carbs or FI? Start simple 1st - When was the last time the fuel filter was changed? Thank you, it has twin Weber carbs... I got the car in January from Oregon, I’m in PA. Not sure when the fuel filter was done last, but appears new. |
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| SteelerMike77 |
Apr 7 2019, 05:28 AM
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#6
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Newbie Group: Members Posts: 24 Joined: 12-February 19 From: Mountville, Pa Member No.: 22,874 Region Association: MidAtlantic Region |
QUOTE(porschetub @ Apr 6 2019, 03:47 PM) Sounds like a "lean" condition,whats the idle like ?. Thank you... Idle is fine, it only does it when trying to accelerate, BUT NOT always! Could it be bad gas? What octane fuel would you recommend? |
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| Dave_Darling |
Apr 7 2019, 10:24 AM
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#7
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914 Idiot Group: Members Posts: 14,986 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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It is almost never "bad gas". It gets blamed an awful lot, but is very rarely the actual problem.
A stock motor is designed for regular-grade gas. Sometimes when cars have carb conversions done, the motor is re-worked and requires higher octane fuel. Often that is not done. Unless you have details about the motor, it is hard to say for certain. If you put regular in the car and it doesn't ping, you should be fine. Conversely, you can put super-grade fuel in just to be safe if you have doubts. But your problem is almost certainly not caused by "bad gas". Go through the things suggested above and you should find it. Start with the ignition, then check fuel pressure and delivery, then look for vacuum leaks. --DD |
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| rhodyguy |
Apr 7 2019, 10:35 AM
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#8
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,080 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
Dual carbs. Single throat or double? Is this a new issue or this way when you got the car? Post pictures of the carbs/fuel pump/linkage and fuel filter. What is the idle rpm when warm? How are the fuel lines routed in the eng compartment? Does the power loss occur above 3krpm? Look at the spark plugs.
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