Question about 1991 Honda Prelude

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Hi I have a 91 Honda prelude si manual fuel injection and I think it has a vacume leak I just can't find it or it may be one every time I try driving it it bogs down n it back fires allot light blue smoke comes out the exaust but every once in a while I can get some power but it keep bogging down n wont really move n bog way down to bout 100 rpms but when I let off the gas it is normal any help would be great

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Check the timing. Backfiring may be from timing is wrong, or valve train problems. I would do a compression test of the engine before buying any new parts. This will tell you the internal health of the engine, how sound it is. This is more than a small vacuum leak, like from a vacuum hose; maybe a large air leak, like the intake manifold gasket, just a possibility, but do the compression test first.
Blue smoke would be oil burning, is your engine worn out (compression test!)? A '91 prelude could have 400,000 miles !

Posted on Mar 30, 2015

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  • austin Mar 31, 2015

    and the back fireing is coming from mostly my air filter n I found a hose on my fuel injection where if I push it on more my rpms r more normal I would say how much but my gueges dnt work right now I dnt really have wifi would there b any way I can have u text me it would be way easer lol like she drove great till I stopped driving at a light then it seemed like it just wouldn't go more then bout 3mph

  • montehammons Mar 31, 2015

    Ki, yiyi. That some car, beats my old now-deceased '87 celica by a mile. sorry not even a cell phone, old folk, retired, no texting...a few more years back (about 2003) i had a beater 81 accord, and found a good forum for hondas, smart guys knew a lot, cannot remember name of forum, google hondas or preludes. read a little more on 3rd gen preludes: you have the 2.0 DOHC? or the B21A1 engine, a revised, souped up version (+10 HP)? that engine was prone to high oil consumption due to tough cylinder liners that were hard on piston rings, according to wikipedia, anyway. well, backfires start in the intake, so you would experience it at the air box. That loose hose is intriguing, it not a fuel line right? else you'd have fuel spilling. so is it a vacuum line to the fuel pressure regulator on the fuel pipe? if you have gas coming out of that nipple, the regulator is bad and must be replaced, about $50 at rockauto, (best prices anywhere). if it startede suddenly, sounds not like a timing problem, just possibly a valve problem, but first do as tommy suggested, check fuel pressure, wrong pressure causes havoc, multiport injected engine could be as high as 40 psi, don 't know honda specs, though, and hondas and toyotas, some of them no test port for fuel press. gauge, so one would have to tee into the fuel line somewhere, probably around the fuel filter, hope you have a shrader valve ( test port) on the fuel pipe, makes testing very easy. all I can think of for now, keep at it, u candooit ! if all else fails, do the compression test, lots of how to videos on youtube. good luck, bro.

  • austin Mar 31, 2015

    Thanks montehammons helps me allot say I got the b21a1 dohc 2.1 n is there a way I can check where the fuel line n filter or pump is I'm sorry I'm asking allot haha I'm new to cars haha but I traded this car n I havnt had time to work on it n now tht I do I have slowly found stuff with it but like when I'm driving the gas pedal when I push it slowlyit wrkssfine but if I push it normal it bogs way down one time it died cuz rpms where low any help ion tht haha thanks. For helping me tho

  • montehammons Apr 01, 2015

    The fuel filter is under the hood, in back of engine, mounted to the middle of firewall, or just to the passenger side more. Has two fuel lines to it, one is the line coming from the gas tank and going to the inlet side or end of the fuel filter. The other line comes from the outlet of the filter, and goes to the engine, to the fuel pipe that holds the injectors-on top of the engine. Sounds like you have a fuel problem, so change the filter, and if no help, have the pressure checked, to see if you need a new fuel pump. The pump is inside the gas tank,not very easy to replace, doable, but not easy.


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Sounds like a fuel delivery problem. Have you checked fuel pressure with a gauge?

Posted on Mar 30, 2015

  • austin Mar 31, 2015

    My gas gauge says I have more then a full tank could tht mean anything is there anything I can do cheap cuz I'm really broke with this car right now any info would help me I'm ok with trying everythin


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Have you checked out the exhaust system , it sound like the engine converter or muffler is blocked.

Posted on Jun 19, 2015

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Posted on Jan 02, 2017

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SOURCE: engine bogs down at 3500 rpms and low trac and or abs light comes on

You are spinning your tires ... read your manual ... shut off the traction control .... spin away!

Posted on Apr 30, 2009

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SOURCE: my integra bogs down at higher rpms

First run a tank of a strong fuel system cleaner like BG-44K. If that doesn't help, clean the throttle body. If that doesn't help, take it to a mechanic.

Posted on Nov 03, 2009

  • 1 Answer

SOURCE: Why does my 91 VW Jetta stall out and lose power while driving?

I had a similar problem and the mechanic diagnosed it as a problem with the ignition coil. So you might want to get that checked.

Posted on Nov 11, 2009

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SOURCE: car will start but when pressing gas pedal, engine

bad plugs + wires and coil.also weak fuel pump.stopped up fuel filter and fuel injectors.

Posted on Nov 17, 2009

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SOURCE: 2002 Audi A4 3.0 Stalling and bogging down majorly.

Ignition coils has to be the answer. if it was the fuel pump your car wouldnt start. So i would say contact audi. they should have sent you a letter in the mail. We have the same car and i got a letter from them. ignition coils are the recall for the 02 a4.

Posted on Apr 08, 2010

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