98 trans am
08-13-2021, 08:11 AM
#1
98 trans am Just got my 98 t/a back. Hci heads cam intake injectors etc. Stage 2 performa built tranny. 3200 pt stall. I have a rly bad jerking at like 40mph and under I'll be coasting in town let's say and the car start jerking super bad and clunking almost like a miss fire. No codes no nothing but feels like irs coming from the rear end drive shaft area. Everything's seems tight
08-13-2021, 10:42 AM
#4
The reason I asked about rear end ratio because of potential 2.73s' At about 40mph is where the torque converter direct drive clutch engages/disengages. 3.23s' in 4th gear at 40mph with the torque converter lockup clutch engaged would put you at about 1200rpm. You mentioned cam, don't know how 'wild' the specs are. At that low an rpm with a 'cam', torque/hp is very low and the engine is 'struggling' which would show as bad jerking. Lockup clutch engaging/disengaging/engaging and so on. Do a test, braking/brake light circuit disengages lock up clutch, when the 'problem' is occurring, slightly step on brake and hold it there, not enough to start braking but enough to disengage the clutch circuit. If bad jerking goes away, the 'wild' cam at low rpm is causing it. Post back as far as what happens.
08-13-2021, 10:45 AM
#5
The reason I asked about rear end ratio because of potential 2.73s' At about 40mph is where the torque converter direct drive clutch engages/disengages. 3.23s' in 4th gear at 40mph with the torque converter lockup clutch engaged would put you at about 1200rpm. You mentioned cam, don't know how 'wild' the specs are. At that low an rpm with a 'cam', torque/hp is very low and the engine is 'struggling' which would show as bad jerking. Lockup clutch engaging/disengaging/engaging and so on. Do a test, braking/brake light circuit disengages lock up clutch, when the 'problem' is occurring, slightly step on brake and hold it there, not enough to start braking but enough to disengage the clutch circuit. If bad jerking goes away, the 'wild' cam at low rpm is causing it. Post back as far as what happens.
08-13-2021, 10:45 AM
#6
little more insight my bad. Pre big cam ngl almost specs a s a ms4 its a ls pro summit cam stage 3. 232/242 113lsa +3 i wanna say.. car runs amazing besides this now.. if I'm on the gas even a little its gone but coasting and braking it goes away but more gas then brake.
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08-13-2021, 01:20 PM
#9
I get a lope at idle yea. Nothing crazy but a normal good cam lope. No surging. Legit only happens 40mph and under cruising.u can kinda feel it letting off at 60 mph just coasting it happens its rly wierd.