I've had a silver 01 cobra for six months. a previous owner put in a fuel cell, oversized fuel filter and line, bored short block (with procharger and more, 525hp), plus an '03 IRS, then put a stock cobra '01 engine back in, replaced fuel cell with '03 tank/pump, added stc chip "for change of gear" (3.55 instead of 3.72) and sold the car. No tune that i'm aware of.
the car was sold to the guy i bought the car from, at 4,500 miles. leakdown test was very, very good, plugs still had grease on caps, under the manifold was very clean, however fuel pump was missing the gasket (fuel leaked at fill up) and the evap system was not connected (vacuum lines plugged, cannister connection open).
fuel pump gasket was put in at one shop, evap system restored by another, and car runs very smooth now, particularly between 1000 and 2000rpm. Idle is usually steady at 800, acceleration from 3000rpm WOT is close to what i expected.
EXCEPT there's slight fuel vapors coming from somewhere at the rear of the car, and there's an occasional stall if in gear. if not in gear, rpm falls off to 400 like it's going to die out, followed by a 'rushing air' sound, engine surges to 1500 then settles back to normal. this happens every 3rd day driving at completely random points: at red light, coasting in 3rd gear, moderate acceleration in 2nd, never at WOT. after a stall i have to wait 10 seconds or so before it will start again, it never starts inside 10 seconds after a stall, but it always starts and always runs fine "until the next time. the shop that restored the evap system said a pressure test "held overnight".
So, long story, three - no four - questions: what can i look for to find the fuel vapor source? does the IAC tend toward erratic performance which might explain the above stalling and rushing air sound? should i trust a local ford dealer to look into these two problems? and four, should i buy the expensive helm inc (http://www.helminc.com) shop book before going to the shop (again). many thanks -
the car was sold to the guy i bought the car from, at 4,500 miles. leakdown test was very, very good, plugs still had grease on caps, under the manifold was very clean, however fuel pump was missing the gasket (fuel leaked at fill up) and the evap system was not connected (vacuum lines plugged, cannister connection open).
fuel pump gasket was put in at one shop, evap system restored by another, and car runs very smooth now, particularly between 1000 and 2000rpm. Idle is usually steady at 800, acceleration from 3000rpm WOT is close to what i expected.
EXCEPT there's slight fuel vapors coming from somewhere at the rear of the car, and there's an occasional stall if in gear. if not in gear, rpm falls off to 400 like it's going to die out, followed by a 'rushing air' sound, engine surges to 1500 then settles back to normal. this happens every 3rd day driving at completely random points: at red light, coasting in 3rd gear, moderate acceleration in 2nd, never at WOT. after a stall i have to wait 10 seconds or so before it will start again, it never starts inside 10 seconds after a stall, but it always starts and always runs fine "until the next time. the shop that restored the evap system said a pressure test "held overnight".
So, long story, three - no four - questions: what can i look for to find the fuel vapor source? does the IAC tend toward erratic performance which might explain the above stalling and rushing air sound? should i trust a local ford dealer to look into these two problems? and four, should i buy the expensive helm inc (http://www.helminc.com) shop book before going to the shop (again). many thanks -
don't know about mileage yet, drove for an hour yesterday at lunch, very nice. idle curiously down to 650/700 from 800 which i thought was programmed. the shop that did the work is great, too: good diagnostics, very thorough, but still very reasonable.
