03 VQ35de swapped hatch idle issues/ sputtering - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

nddavis2 · 08-22-2016, 04:53 AM

'03 vq35de in a 91 hatch with minor mods- Intake, high flow cats, cat back exhaust.

Idle is not consistent and when engine temps reach around 140 degrees, the idle starts dropping down to the 400s. When e-fans are running full, idle drops bad and car starts to choke and will bog down and cut off at times. I've checked fuel pressure and it's good at 51 psi, cleaned the MAF and throttle body, have done all the relearn procedures, have no codes on the ECU at all, and changed plugs to try to help the problem.

Checked compression (at 124 degrees per my aem gauge)
Cylinder 1: 180
Cylinder 2: 185
Cylinder 3: 190
Cylinder 4: 185
Cylinder 5: 185
Cylinder 6: 185

These were taken dry and I did not get around to getting it done quick enough to consider it truly up to operating temp however they were pretty consistent across the board so I think I'm ok there.

When I try to drive it, the car hesitates and sputters/ backfires a little to begin with and feels like it doesn't have any power. I imaging the ECU senses something isn't right and is messing with the timing thus pulling power. I'm just not really sure where to go from here.

08-22-2016, 04:53 AM	#1
nddavis2 Zilvia Member Join Date: Sep 2009 Location: SC Age: 42 Posts: 209 Trader Rating: (4) Feedback Score: 4 reviews	03 VQ35de swapped hatch idle issues/ sputtering '03 vq35de in a 91 hatch with minor mods- Intake, high flow cats, cat back exhaust. Idle is not consistent and when engine temps reach around 140 degrees, the idle starts dropping down to the 400s. When e-fans are running full, idle drops bad and car starts to choke and will bog down and cut off at times. I've checked fuel pressure and it's good at 51 psi, cleaned the MAF and throttle body, have done all the relearn procedures, have no codes on the ECU at all, and changed plugs to try to help the problem. Checked compression (at 124 degrees per my aem gauge) Cylinder 1: 180 Cylinder 2: 185 Cylinder 3: 190 Cylinder 4: 185 Cylinder 5: 185 Cylinder 6: 185 These were taken dry and I did not get around to getting it done quick enough to consider it truly up to operating temp however they were pretty consistent across the board so I think I'm ok there. When I try to drive it, the car hesitates and sputters/ backfires a little to begin with and feels like it doesn't have any power. I imaging the ECU senses something isn't right and is messing with the timing thus pulling power. I'm just not really sure where to go from here.