Hello,
I have an issue that I'm really hoping someone will be able to shed some light on; i'll keep it as short as possible
1st. The car I'm working on is an '87 Cougar XR-7. This car has been my Dad's since '96 and it has gone through many engine/tranny transplants each one becoming more aggressive. The car was given the HO 5.0 guts, wiring and mass air from a '89 GT about 9 years ago or so. Cams, heads, intakes, fuel pumps etc. have come and gone and the car has always ran really well. About two months ago we installed a 347 from Coast with Pro comp 2.02 heads, 10.88 CR, Comp XE282 Cam, Trick Flow intake, 75 TB etc.
2nd. The issue is that the car is running rough and also having a major lean condition which in turn is causing some pre-ignition pinging. I'm not talking like at 4k or higher, it's been happening with very little throttle just to start rolling say past 30 mph. If you give the car more then about a 1/3 throttle it pings...bad!! We have an AEM wide band on the car and the A/R is off the scale lean wise. The plugs are porcelain white, no slight tan color here. The car has a big problem staying running and dies as soon as you put in in gear, of course it sputters and no power. Now mind you that the warmed over 5.0 with b-cam and 1.94 aeroheads etc. ran perfect so I doubted it was wiring but have checked it anyway.
3rd. I have researched and researched and have tried this or that!!! Ok, so this is what has been installed recently or tried on the car.
~All wiring and grounds have been combed over and tested. block, chassis, computer, firewall etc.
~New 3G alternator with an additional 4 gauge wire from block to negative battery pigtail on fender.
~No vacuum leaks, car holds about 14 hg at idle and even tried a pressure gauge on the crank case and got 1-2 psi at idle indicated no internal vacuum leak like under the intake. New vacuum hose everywhere anyway.
~Ran engine with no vacuum hoses and everything capped to eliminate any vacuum variables HVAC, booster etc.
~New TPS set at .98v
~New IAC, EGR and EVR, PCV, ACT, o2 sensors
~Have tried 3 different sets of injectors and 3 mass air meters. 2 Pro-M 75 MAF for 24s and even tried a stock MAF with 19s to see if the idle would smooth out but to no avail.
~New Walbro 400 lph pump and fuel filter
FPR set at 40psi with hose off and for fun tried 50 but no change
~checked for crushed fuel lines
~I've tested the mass air wiring and had steady 1 volt at idle and smooth numbers up and down while revving.
~Tried 2 different A9P computers.
~Two different distributors, one a new stock style with a new TFI module and the other a MSD.
~Two MSD blaster coils
~New MSD cap, rotor and ACCEL 300+ wires
~The timing is set at 7 initial with spout off for setting and also has a new Romac balancer. Have tried all different settings and if you go up to 14 BTDC it kills the engine.
~Drove the car with a fuel pressure gauge to monitor and it held steady
~Pulled codes and got a secondary fuel pump circuit fault code, but have read that if the pump runs to disregard the code. Don't know about that one.
~Tank has 5 gallons of 100 fuel
~ cleaned the salt and pepper shakers.
~no check engine light
~New autolite 3294 plugs and have tried NGK TR6's
~All cylinder pressure is in the 160-165 range
May have forgotten something but the car runs really crappy and way lean and I am totally out on what to do next.
I've never been so stumped on one of these cars and I've worked on many of my own and others.
Any and all help or suggestions are greatly appreciated!!!! Thanks for reading!
I have an issue that I'm really hoping someone will be able to shed some light on; i'll keep it as short as possible
1st. The car I'm working on is an '87 Cougar XR-7. This car has been my Dad's since '96 and it has gone through many engine/tranny transplants each one becoming more aggressive. The car was given the HO 5.0 guts, wiring and mass air from a '89 GT about 9 years ago or so. Cams, heads, intakes, fuel pumps etc. have come and gone and the car has always ran really well. About two months ago we installed a 347 from Coast with Pro comp 2.02 heads, 10.88 CR, Comp XE282 Cam, Trick Flow intake, 75 TB etc.
2nd. The issue is that the car is running rough and also having a major lean condition which in turn is causing some pre-ignition pinging. I'm not talking like at 4k or higher, it's been happening with very little throttle just to start rolling say past 30 mph. If you give the car more then about a 1/3 throttle it pings...bad!! We have an AEM wide band on the car and the A/R is off the scale lean wise. The plugs are porcelain white, no slight tan color here. The car has a big problem staying running and dies as soon as you put in in gear, of course it sputters and no power. Now mind you that the warmed over 5.0 with b-cam and 1.94 aeroheads etc. ran perfect so I doubted it was wiring but have checked it anyway.
3rd. I have researched and researched and have tried this or that!!! Ok, so this is what has been installed recently or tried on the car.
~All wiring and grounds have been combed over and tested. block, chassis, computer, firewall etc.
~New 3G alternator with an additional 4 gauge wire from block to negative battery pigtail on fender.
~No vacuum leaks, car holds about 14 hg at idle and even tried a pressure gauge on the crank case and got 1-2 psi at idle indicated no internal vacuum leak like under the intake. New vacuum hose everywhere anyway.
~Ran engine with no vacuum hoses and everything capped to eliminate any vacuum variables HVAC, booster etc.
~New TPS set at .98v
~New IAC, EGR and EVR, PCV, ACT, o2 sensors
~Have tried 3 different sets of injectors and 3 mass air meters. 2 Pro-M 75 MAF for 24s and even tried a stock MAF with 19s to see if the idle would smooth out but to no avail.
~New Walbro 400 lph pump and fuel filter
FPR set at 40psi with hose off and for fun tried 50 but no change
~checked for crushed fuel lines
~I've tested the mass air wiring and had steady 1 volt at idle and smooth numbers up and down while revving.
~Tried 2 different A9P computers.
~Two different distributors, one a new stock style with a new TFI module and the other a MSD.
~Two MSD blaster coils
~New MSD cap, rotor and ACCEL 300+ wires
~The timing is set at 7 initial with spout off for setting and also has a new Romac balancer. Have tried all different settings and if you go up to 14 BTDC it kills the engine.
~Drove the car with a fuel pressure gauge to monitor and it held steady
~Pulled codes and got a secondary fuel pump circuit fault code, but have read that if the pump runs to disregard the code. Don't know about that one.
~Tank has 5 gallons of 100 fuel
~ cleaned the salt and pepper shakers.
~no check engine light
~New autolite 3294 plugs and have tried NGK TR6's
~All cylinder pressure is in the 160-165 range
May have forgotten something but the car runs really crappy and way lean and I am totally out on what to do next.
I've never been so stumped on one of these cars and I've worked on many of my own and others.
Any and all help or suggestions are greatly appreciated!!!! Thanks for reading!
So the difference between "0" marks on the two balancers is seventy degrees. That means that by setting the timing at the "ahem" 14 degrees initial was actually setting it at 84 initial!! Pinging problems indeed!! The CORRECT balancer is on its way and THEN should be able to tune it......
