bizmackus Posted February 14, 2017 Share Posted February 14, 2017 Hello all, Car: 99 GT wagon 5mt. 182,000 miles Issue: Car stumbles and bogs under load and when blipping the throttle at idle. When the engine is cold and the idle is still high, I can blip the throttle all I want and there is no sign of stumbling or bogging. Problems begin when the car warms up. If I very gently give throttle the engine revs smooth. If I blip throttle the engine stutters and bogs. Driving is the same, if I am very gentle on the throttle is revs fine, but as soon as I put my foot down it bogs and stumbles like crazy until it gets to about 3k rpm- feels like its misfiring. Things I have done: Replaced Upstream 02 Tested knock sensor with multimeter, inspected for damage / cracks Replaced Ignition coil (primary coil tested at 1ohm both leads) Replaced all vacuum lines & checked for vacuum leaks with propane and water Checked & cleaned Crank position sensor Checked & cleaned Cam position sensor Cleaned IACV Cleaned MAF (with crc maf cleaner) Checked ignition timing with timing light Changed oil Checked plugs (they looked alright) Best of all, NO CHECK ENGINE LIGHT New NGK wires will be delivered tomorrow I am at a loss otherwise! Please Help!! Link to comment Share on other sites More sharing options...
Brighton96 Posted February 14, 2017 Share Posted February 14, 2017 Well you did everything I would have started with haha. Maybe a fuel thing? Pull the inlet hose and check for water, pull the filter off and try to blow through it. Check the air filter if you haven't already. Maybe replace the fuel pump sock if you find anything odd about the fuel Link to comment Share on other sites More sharing options...
doublechaz Posted February 14, 2017 Share Posted February 14, 2017 Check your cam belt hasn't jumped teeth. That is not completely unlike how mine ran when one cam jumped 2 or 3 teeth. The time warp in the computer when the cam and crank sensor say 'we are at 0 degrees' at different times get spark and injector all confused. Skips some and doubles up on some. But no check engine light. Link to comment Share on other sites More sharing options...
bizmackus Posted February 14, 2017 Author Share Posted February 14, 2017 Thanks for the tips- I pulled the timing cover and everything is all lined up. I'm curious about the fuel filter- I've had the car for 50k miles and haven't changed it. Guess its back to the parts store tomorrow! Link to comment Share on other sites More sharing options...
bizmackus Posted February 14, 2017 Author Share Posted February 14, 2017 The local parts store is open till 9 around here so I said why not and ran down to pick up a fuel filter. Let me say, the fuel pump relay in a 99 legacy is nearly impossible to reach unless you have arms the size of twigs, as its way up in the dash.. I had to use a long needle nose to grab the tab and pull it out. Anyway I got the filter in and it was a night and day difference. Totally solved my issue!! Smooth revving from idle and up with no stumble! Amazing what a clogged fuel filter can do to your cars performance. Thanks again brighton96!! Link to comment Share on other sites More sharing options...
doublechaz Posted February 14, 2017 Share Posted February 14, 2017 Great! Wow, that thing must have really been plugged to ruin your power that much. Glad it was that rather than timing. Much easier to deal with. Link to comment Share on other sites More sharing options...
Brighton96 Posted February 14, 2017 Share Posted February 14, 2017 Swweeett! Glad it fixed it. I would also do the fuel pump sock in that case. It's only like $7 and takes about 35 mins to swap, worst part is your interior will smell like gas for a couple days. But if the fuel filter was that bad, I can't imagine the sock haha. Link to comment Share on other sites More sharing options...
doublechaz Posted February 14, 2017 Share Posted February 14, 2017 While we're on the topic of fuel flow and starvation... My google foo has failed. Does anyone know the flow rating of the OE equiv Bosch Fuel pump? Link to comment Share on other sites More sharing options...
Brighton96 Posted February 14, 2017 Share Posted February 14, 2017 I don't know the actual figure but I filled up a 20oz water bottle in about 15 seconds. So just have to do some math! Link to comment Share on other sites More sharing options...
doublechaz Posted February 14, 2017 Share Posted February 14, 2017 So about 140 liters/hour. Seems like that would be plenty for 2.2 NA all else being functional... Link to comment Share on other sites More sharing options...
bizmackus Posted February 14, 2017 Author Share Posted February 14, 2017 If I'm going to replace the pump sock I might as well replace the pump while I have the tank open. Figure the pump has 180k on it far as I know, plus it was probably straining trying to pump against the clogged filter. Link to comment Share on other sites More sharing options...
Brighton96 Posted February 14, 2017 Share Posted February 14, 2017 Wait, I lied. I forgot how many ounces a normal water bottle is. It was 16.9oz in about 15 seconds. And yes you mind as well get it over with while you are there, make sure to get a new rubber tank seal when you do this too, chances are the old one is dried out. 180k is considerable for a pump so even if it's still good, I'd replace it and keep the old one as a back up. Link to comment Share on other sites More sharing options...
doublechaz Posted February 15, 2017 Share Posted February 15, 2017 17 ~ 20. Close enough. Link to comment Share on other sites More sharing options...
Brighton96 Posted February 15, 2017 Share Posted February 15, 2017 I calculated 25.425 gallons per hour. I wasn't able to find the specs of the Bosch one, when I searched specs I just got useless information like package size and pump weight. But the Denso OEM replacement says max of 50gph at a max pressure of 85-90psi. Link to comment Share on other sites More sharing options...
doublechaz Posted February 15, 2017 Share Posted February 15, 2017 Same as me, just shipping info and related crap. I'm chasing a flat spot at WOT near redline. I expect I've passed the end of what the factory ECU can handle. I was just checking if fuel flow might be the problem. I need to get a spare bung welded in my new exhaust so I can put the wideband back in... Link to comment Share on other sites More sharing options...
bizmackus Posted February 16, 2017 Author Share Posted February 16, 2017 I found the fuel pump access plate, but I am curious if anyone knows what this access plate is to the right, on the driver's side of the car is? Link to comment Share on other sites More sharing options...
Brighton96 Posted February 16, 2017 Share Posted February 16, 2017 It's just an access panel and I think on RHD/JDM ones that's where the gas tank/fuel pump is? Link to comment Share on other sites More sharing options...
choover1101 Posted February 16, 2017 Share Posted February 16, 2017 Fuel level sender? (Other panel) Sent from my SAMSUNG-SGH-I747 using Tapatalk Link to comment Share on other sites More sharing options...
doublechaz Posted February 16, 2017 Share Posted February 16, 2017 Sender is with the pump. There is a vent line going to that other cover. I thought there was some kind of rollover valve there, but I'm not sure. Link to comment Share on other sites More sharing options...
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