1990 L98 stalling problem
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Joined: Dec 2013
Posts: 87
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1990 L98 stalling problem
Hello everyone,
i just rebuilt the bottom end ( new pistons, crank, camshaft, bearings etc
-bored .030 oversize
-stock heads with new valve job
-camshaft from comp cams (set up at 0 degrees)
-gross lift .480
- duration@ .050 Intake 210degrees exhaust 220degrees
-all the sensors and gaskets are brand new
-brand new fuel pump and adjustable fuel regulator set to 45psi
-no vacuum leaks
-new spark plugs and wires with new coil
-ignition based time at 11 degrees advanced
-automatic transmission 700r4
- both pre converters removed along with main converter
-AIR system removed/blocked
- no speedometer or odometer
The car is stalling on me when i come to a stop or coasting to a stop
(did not stall on me before engine rebuilt). Does not have the power and acceleration i was hoping for. it also hesitates to accelerate.
Any help is much appreciated,
Danny C
i just rebuilt the bottom end ( new pistons, crank, camshaft, bearings etc
-bored .030 oversize
-stock heads with new valve job
-camshaft from comp cams (set up at 0 degrees)
-gross lift .480
- duration@ .050 Intake 210degrees exhaust 220degrees
-all the sensors and gaskets are brand new
-brand new fuel pump and adjustable fuel regulator set to 45psi
-no vacuum leaks
-new spark plugs and wires with new coil
-ignition based time at 11 degrees advanced
-automatic transmission 700r4
- both pre converters removed along with main converter
-AIR system removed/blocked
- no speedometer or odometer
The car is stalling on me when i come to a stop or coasting to a stop
(did not stall on me before engine rebuilt). Does not have the power and acceleration i was hoping for. it also hesitates to accelerate.
Any help is much appreciated,
Danny C
Last edited by Drautotech; Jul 26, 2017 at 09:13 PM.
Thread Starter
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Joined: Dec 2013
Posts: 87
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spoke the to comp cams today and they told me i should get the engine tuned to the new cam which means putting a hyper chip in it.
fuel pressure is at 45 psi and jumps up to 52psi with vacuum hose off
not sure about the iac counts i don't have a scan tool with me
should be 52 counts at idle i believe
speedometer and odometer has never worked since i had the car.
show 0mph and last known mileage
(i was told it could be the ccm)
fuel pressure is at 45 psi and jumps up to 52psi with vacuum hose off
not sure about the iac counts i don't have a scan tool with me
should be 52 counts at idle i believe
speedometer and odometer has never worked since i had the car.
show 0mph and last known mileage
(i was told it could be the ccm)
Last edited by Drautotech; Jul 27, 2017 at 07:42 PM.
Thread Starter
Advanced
Joined: Dec 2013
Posts: 87
Likes: 0
Thread Starter
Advanced
Joined: Dec 2013
Posts: 87
Likes: 0
Team Owner
Joined: Jul 2004
Posts: 28,474
Likes: 3,291
From: Hartford WI
spoke the to comp cams today and they told me i should get the engine tuned to the new cam which means putting a hyper chip in it.
fuel pressure is at 45 psi and jumps up to 52psi with vacuum hose off
not sure about the iac counts i don't have a scan tool with me
should be 52 counts at idle i believe
speedometer and odometer has never worked since i had the car.
show 0mph and last known mileage
(i was told it could be the ccm)
fuel pressure is at 45 psi and jumps up to 52psi with vacuum hose off
not sure about the iac counts i don't have a scan tool with me
should be 52 counts at idle i believe
speedometer and odometer has never worked since i had the car.
show 0mph and last known mileage
(i was told it could be the ccm)
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Posts: 6,482
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From: Clearwater Florida
..... Set the base timing @ 6* ... There is a procedure in the factory service manual for setting the Minimum idle (base idle) ... make sure you reset the TPS if any changes are made to the idle speed adjusting screw ... with a scanner , you can set the idle by adjusting the IAC counts to the 20 range at hot idle in neutral ... again , recheck the TPS ..... ANY and ALL tuning advice is made while assuming that there are no other issues ... mechanical or otherwise ... with your set-up .....
Last edited by C409; Jul 28, 2017 at 08:03 AM.