Dbeluscak Posted March 23, 2021 Share Posted March 23, 2021 I know this is an "old" issue. I've read through the older posts on the subject. I've got a similar issue with one of my 93's. Just wanted to pick everyone's brain real quick. See if I could find any new answers. 93', SPFI, EA82, Manual trans. This is a strange one, the car idles and revs at idle just fine. Under hard acceleration the engine seems to disappear, there's just no power. Real jerky at low speeds. Doesn't seem to matter dead cold or warmed up. Clutch in - bring up the rpms - clutch out, it will continue to accelerate briefly. Not ideal, obviously. If I feather the throttle (quickly in and out 1-2") throughout the gear, it accelerates fine. Has plenty of power (relatively speaking!). What I've done so far, replaced the entire throttle body with a known good one (borrowed my daily drivers), fresh tune up, timing belts are good, timing @ 20*, no error codes...etc. I haven't cleaned the MAF or checked the O2 sensor. It just has me baffled the way it runs when feathering the throttle. I wouldn't think the MAF or the O2 would be tricked by tapping the pedal throughout the gears. The TPS or IAC made sense, which is why I swapped out the entire TB. Looking forward to any suggestions! I go back to work tomorrow so it'll be a few days before I get to mess with it again. Quote Link to comment Share on other sites More sharing options...
88SubGL Posted March 23, 2021 Share Posted March 23, 2021 It couldn’t be a clogged cat could it? Or perhaps a fuel delivery issue? 1 Quote Link to comment Share on other sites More sharing options...
Dbeluscak Posted March 24, 2021 Author Share Posted March 24, 2021 Doubtful on either as it runs great if I pump the throttle. I'm going to check / swap the O2 and clean the MAF. See if that helps. Quote Link to comment Share on other sites More sharing options...
DaveT Posted March 24, 2021 Share Posted March 24, 2021 I've never had the O2 do anything but cause emissions failure. Could be mildly starving for fuel, T in a pressure gauge. 21PSI, no less. The CTS can cause drive ability problems, but usually it will run ok hot OR cold. Or random / intermittent. I have never had a MAF problem. Also, check the wiring from the sensors to the ECU. They can fail also. BTDT. 1 Quote Link to comment Share on other sites More sharing options...
idosubaru Posted March 24, 2021 Share Posted March 24, 2021 Read current and stored codes check fuel pressure as said Disconnect oxygen sensor connector and see if anything changes? I’d swap a spare MAF, it’s so easy. but I have extras so that’s easy for me to say the SPFI doesn’t have a knock sensor does it? Quote Link to comment Share on other sites More sharing options...
Dee2 Posted March 24, 2021 Share Posted March 24, 2021 Step #1 :: Read the codes Quote Link to comment Share on other sites More sharing options...
DaveT Posted March 24, 2021 Share Posted March 24, 2021 No knock sensor on SPFI. 1 1 Quote Link to comment Share on other sites More sharing options...
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