engine surge

Heads, valves, pistons, rods, crankshaft, etc...

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Flip_x
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engine surge

Post by Flip_x »

Hmm when i drive my car around the 4k range it like surges and it feels like it lost gas or something for like one cycle of the engine. is that just hesitation? or something else
1990 Legacy Sedan LS AWD 5-MT 162k miles Slate Metallic (Sold to Brother)

1992 Legacy SS AWD 5-MT 180k miles Mica Black
georryan
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Post by georryan »

When was the last time you did a tune up? Are you flooring it at 4000, or are you just modestly on your gas pedal? How full was your tank?

We need some more information :)
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Flip_x
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Post by Flip_x »

it does it when i floor it, tune up, hmm i changed the oil and spark plugs last month, and air filter. there was enough gas it does it when its full too. it just surges like a loss of power for one cycle. u can feel the surges. or stumble i guess
1990 Legacy Sedan LS AWD 5-MT 162k miles Slate Metallic (Sold to Brother)

1992 Legacy SS AWD 5-MT 180k miles Mica Black
georryan
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Post by georryan »

Well I would definately look at your fuel filter and see if that helps. They aren't that much money. I see you have a n/a car so there isn't much in the way of turbo problems that you could be having. I would probably check the fuel filter first and see how that helps things.
91 Pearl White Sport Sedan
04 Java Black Pearl Forester XT
2014 Volvo S60 T5
18 KTM 1290 Adventure S

87 Grey GL-10 Sedan (so long old buddy) - donated
97 Toyota 4Runner SR5 - sold
2002 BMW r1150rt-p - sold
2004 BMW r1200ST - sold
2016 BMW r1200RS - sold
Flip_x
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Post by Flip_x »

where is the fuel filter located at?
1990 Legacy Sedan LS AWD 5-MT 162k miles Slate Metallic (Sold to Brother)

1992 Legacy SS AWD 5-MT 180k miles Mica Black
georryan
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Post by georryan »

Mine is located under the hood just in front of the brake fluid bottle. There is one line coming into it, and one going out. It is a cylinder shaped thing next to the driver's side strut tower.
91 Pearl White Sport Sedan
04 Java Black Pearl Forester XT
2014 Volvo S60 T5
18 KTM 1290 Adventure S

87 Grey GL-10 Sedan (so long old buddy) - donated
97 Toyota 4Runner SR5 - sold
2002 BMW r1150rt-p - sold
2004 BMW r1200ST - sold
2016 BMW r1200RS - sold
BAC5.2
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Post by BAC5.2 »

Maybe fuel cut? I doubt it though, maybe just hesitation.

My hesitation was caused by a bad seal around the TB. That was actually the cause for a LOT of my problems.
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evolutionmovement
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Post by evolutionmovement »

I'd bet fuel filter, too. Its about a 4" diam cylinder with the two lines on the top about maybe 6" high.

Steve
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Flip_x
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Post by Flip_x »

i dont think its the fuel filter because it still has power when i floor it. maybe its a misfire. its just annoying to have this. oh it only does it once in a while once the engine is at operating temp.
1990 Legacy Sedan LS AWD 5-MT 162k miles Slate Metallic (Sold to Brother)

1992 Legacy SS AWD 5-MT 180k miles Mica Black
evolutionmovement
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Post by evolutionmovement »

Whenever mine goes it only causes problems with off-line hesitation. I replace it about every 20K which is about how long it takes for it to give me the hesitation.

Steve
Midnight in a Perfect World on Amazon or order anywhere. The first book in a quartet chronicling the rise of a man from angry criminal to philanthropist. Midnight... is a distopic noirish novel featuring 'Duchess', a modified 1990 Subaru Legacy wagon.
Flip_x
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Post by Flip_x »

i'll try it soon and i will post up to tell ya if it helped
1990 Legacy Sedan LS AWD 5-MT 162k miles Slate Metallic (Sold to Brother)

1992 Legacy SS AWD 5-MT 180k miles Mica Black
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