Do you have a wideband a/f guage?
Here recently my car has been feeling extra sluggish more so then normal. Well as of lately it started what felt like a misfire every now and then only under load. The car currently has no power what so ever.. literally like no power under load I cant speed up hardly to get around someone now.
I've replaced, plugs, wires, and coil pack yet the issues still occurs. The car idles fine and I can rev it no problem. However I cant accelerate worth a fuck due to this misfire/stumble/no power issue. Even if I roll onto the throttle you can feel the car bog down right before its going to stumble and misfire. It does not do it to the point that it throws a CEL which is the weird part.
Now I can cruise down the road without issue its just trying to accelerate that I have an issue with. I was told to remove the vac line adn plug it off the FPR and see if that made any difference and it did not. Also the car still sounds the same while running with the MAF disconnected and still revs fine.
I'm currently trying to get a hold of one of the local MSPer's to see if I can switch MAFs for a few min just to see if that is my issue or not. I also hear that it could also be the TPS and or the IAC. However I have no ways of testing those and no CELs on the car currently.
Edit: Another thing to note is that it really seems to be a load issue. Every time the car gets around -5 of the boost gauge it bogs and acts up.
Perrin FMIC, Turbo X's BPV, Greddy SP2 catback, Perrin SRI, Stock tune and stock 6psi boost.
Do you have a wideband a/f guage?
Black Mica 02 Protege ES-T aka TurboMatic
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autometer a/f wideband, boost-trans and oil temp, oil pressure-
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Or a scan tool to monitor the oem o2 sensor voltages? Either the car is running very lean or very rich.
Also please note any mods done to car as some of us may not be familiar with your setup
How are you controlling fuel?, Fpr and what else? O2 clamp or msp ecu
Yes i did, sorry. When i read fpr, I was thinking an aftermarket fpr. Anyways can you get your hands on a scanner that has live data? You are using premium fuel correct?
These are all possible causes from the service manual:
• Improper A/C system operation
• Erratic signal or no signal from CMP sensor
• Air leakage from intake-air system parts
• VICS malfunction
• Tumble swirl control system malfunction
• Purge control solenoid malfunction
• EGR valve malfunction
• Brake dragging
• Erratic signal from CKP sensor
• Low engine compression
• Vacuum leakage
• Poor fuel quality
• Spark leakage from high-tension leads
• Air cleaner restriction
• PCV valve malfunction
• Improper valve timing due to jumping out of timing belt
• Restriction in exhaust system
• Intermittent open or short in fuel pump circuit
• Inadequate fuel pressure
• Fuel pump mechanical malfunction
• Fuel leakage from fuel injector
• Fuel injector clogging
• Intermittent open or short of MAF sensor, TP sensor and VSS
• ATX malfunction
• Clutch slippage
How did the plugs look when you replaced them?
2003.5 MSP Titanium Grey #1421 - SOLD
1994 Chevy Blazer 6.5TD - Traded
2006 GTO Quicksilver Metallic LS2/M6 - 426hp/416tq - SOLD
1993 Chevy K2500 - SOLD
2004 Chevy Tahoe - Kid hauler
1999 Chevy Camaro - Traded
2001 Lincoln LS - WHAT A PIECE OF $#!& - SOLD
2008 Pontiac G8 GT - White Hot
You test your wastegate?
Id check your WGA and fuel pressure. We have a spare bung in our J pipes you can put that wideband in....