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View Full Version : No throttle response/ backfire??


Shift-240
04-07-2010, 01:20 PM
Aright I will start by saying I do work at a shop and have all tools needed so no worries there. I have a 1990 s13 240sx SOHC i could really use a guide to what vacuum lines are needed and not. ( I did search ) my problem is that not all the time mainly when she warms up the car will have alot of back pressure and try giving it gas the car will jerk back and forth and wont have any power. Imagine when you hit fuel cut how that feels and its all the time when on full throttle (Sometimes not on full throttle). Tho it only happens randomly... very hard to explain. For a little detail i have changed all belts, rad., intake, fuel filter, and added electric fans. I dont believe I messed with anything that would cause this. The car sat for months and finally i decided to get it running and this is what has happened. At my shop we have bounced around a fuel pump, something with the ignition (spark issue) or a PCV valve..?? Any help would be awesome. Thanx in advance!