rough idle / hesitation....especially in reverse

[satdog75]

Here's my dilemma....When the car is idling, it is a little rough but nothing serious. Acceleration is good with no missing. When the car is put in reverse, it worsens to the point that there is a "shimmy". I have ran down ecu codes, to find none (all diag levels 1-5). I have removed the IAC, cleaned, reistalled, and readjusted. I have removed the EGR valve, cleaned, reinstalled, and tested. I have checked timing (15 btdc). replaced all plugs with NGK, wires replaced with Bosch Platinum (damn those cost over $100), replaced the cap and rotor with standard. Ive run BG44K through tank twice. Seafoamed the intake. Finally sprayed all vaccum lines with throttle body cleaner to see if there is a leak, none. Oh, Ive also used a stethascope to check fuel injectors and all are ticking away.Damn this is becoming the 7th circle of hell. Anyone have any thoughts on it. I think im left with new injectors and ecu, but damn expensive and difficult, so i dont want ot do it if not needed.

forgot...did a power balance test on plugs...all good. havent done it on injectors since they are so tough to get to, i fear damaging the connector trying to get them off.

[swartztech]

Manual or Automatic? if it is manual, is it acting up when u let off the clutch or when your on the clutch or both?

[satdog75]

its an automatic. I spoke to a mechanic that suggested it may be the fuel pressure regulator. question is.....where is it? i have followed the fuel line to the rails but did not locate the regulator. Can this actually be the cause. He suggested it since the car only idles rough / hesitates after it has warmed up for a couple minutes.

[PapaSmurf2k3]

if it only does it after being warmed up for a couple minutes, I'd look into the coolant temp sensor. Fuel pressure regulators rarely go bad.

[satdog75]

instead of bothering testing it, ill just go pick one up since they are 16.99 at Oreilly. there are 2 of them though. One with a dual wire plug and one opposite with a single wire. I am guessing the dual wire one is what i am after and the single wire is for the gauge.....is that correct? my haynes manual isnt very clear on it.

[PapaSmurf2k3]

That is correct!