jarredsoon
Member
- Joined
- Aug 9, 2007
Everything has been great for the last 7000 miles, until this started happening.
When going into boost hard or even easing into it at about 10lbs boost the engine sputters and bucks and the SES light flickers. I let off the gas and everything goes back to normal. No codes are on the scan master. NO knock retard is displayed when this occurs and O2 are above 800 when in boost.
I have checked the following and or swapped parts
maf --- swapped with a known good maf from other car
ecm ---- swapper with a known good ecm
replaced module with new ac delco unit from highway stars
replaced coil pack with one from highway stars
put new plugs in
swapped plug wires from other car
checked and cleaned battery terminals
torqued balancer bolt to 220
replaced fusible links on orange ecm wires by battery
check tps sensor fro dead spots via scan master
checked grounds at back of intake
checked ground on front of cylinder head
observed fuel pressure to increase 1:1 with boost
pulled valve covers and observed all rockers to be moving equally (esp number 3 exhaust)
observed vacuum guage to hold steady at 14 at idle.
removed wires from starter and cleaned and reinstalled tight.
observed the engine running in the dark to see if any arcing or sparks jumping
scan master numbers are all within normal limits, I can post exact figures if needed. Car runs and starts great just can't boost and now its not that much fun to drive.
I am running out if ideas and don't have the money for the shop to figure this out. Please help.
Thanks
Jarred
When going into boost hard or even easing into it at about 10lbs boost the engine sputters and bucks and the SES light flickers. I let off the gas and everything goes back to normal. No codes are on the scan master. NO knock retard is displayed when this occurs and O2 are above 800 when in boost.
I have checked the following and or swapped parts
maf --- swapped with a known good maf from other car
ecm ---- swapper with a known good ecm
replaced module with new ac delco unit from highway stars
replaced coil pack with one from highway stars
put new plugs in
swapped plug wires from other car
checked and cleaned battery terminals
torqued balancer bolt to 220
replaced fusible links on orange ecm wires by battery
check tps sensor fro dead spots via scan master
checked grounds at back of intake
checked ground on front of cylinder head
observed fuel pressure to increase 1:1 with boost
pulled valve covers and observed all rockers to be moving equally (esp number 3 exhaust)
observed vacuum guage to hold steady at 14 at idle.
removed wires from starter and cleaned and reinstalled tight.
observed the engine running in the dark to see if any arcing or sparks jumping
scan master numbers are all within normal limits, I can post exact figures if needed. Car runs and starts great just can't boost and now its not that much fun to drive.
I am running out if ideas and don't have the money for the shop to figure this out. Please help.
Thanks
Jarred