Car stumbles when you hit brake???????
07-08-2008, 03:47 PM
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Car stumbles when you hit brake??????? ok ive searched and searched and it seems no one post what there problem ended up being...... I have a 94 lt1 .060 all forged and a t-trim, fully ported heads, the works.
My problem is when the car is cold is runs perfect, when it heats up it surges and not all the power is there. I get no SES lights and i cant afford a real time scanner.... the opti was new when i put the motor together about 700 miles ago..ECM tested good, coil also, wires are new and not burnt.. PLugs could be smoked due to being too rich. IF the O2's are bad.. I just need some input. Also when i hit the brake when slowing down the rpms drop hard then i have to give it gas to keep it alive. Also the battery guage reads very low.
HELP ME
My problem is when the car is cold is runs perfect, when it heats up it surges and not all the power is there. I get no SES lights and i cant afford a real time scanner.... the opti was new when i put the motor together about 700 miles ago..ECM tested good, coil also, wires are new and not burnt.. PLugs could be smoked due to being too rich. IF the O2's are bad.. I just need some input. Also when i hit the brake when slowing down the rpms drop hard then i have to give it gas to keep it alive. Also the battery guage reads very low.
HELP ME
07-09-2008, 06:45 AM
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check vacuum lines and alternator voltage output... i would check vacuum lines first because the alternator doesn't care if it's hot or cold... so i really don't think it is a charging problem...
Do you have underdrive pulleys?
What cam do you have?
Do you have underdrive pulleys?
What cam do you have?
07-09-2008, 06:50 AM
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ok ive searched and searched and it seems no one post what there problem ended up being...... I have a 94 lt1 .060 all forged and a t-trim, fully ported heads, the works.
My problem is when the car is cold is runs perfect, when it heats up it surges and not all the power is there. I get no SES lights and i cant afford a real time scanner.... the opti was new when i put the motor together about 700 miles ago..ECM tested good, coil also, wires are new and not burnt.. PLugs could be smoked due to being too rich. IF the O2's are bad.. I just need some input. Also when i hit the brake when slowing down the rpms drop hard then i have to give it gas to keep it alive. Also the battery guage reads very low.
HELP ME
My problem is when the car is cold is runs perfect, when it heats up it surges and not all the power is there. I get no SES lights and i cant afford a real time scanner.... the opti was new when i put the motor together about 700 miles ago..ECM tested good, coil also, wires are new and not burnt.. PLugs could be smoked due to being too rich. IF the O2's are bad.. I just need some input. Also when i hit the brake when slowing down the rpms drop hard then i have to give it gas to keep it alive. Also the battery guage reads very low.
HELP ME
Well you have answered your own questions basically, Motor runs fine cold then when it gets to operating temp runs crappy= Bad 02's (Going into closed loop) You ask why no SES light, Your light will not trigger until O2' are completely out not dieing..Low voltage, The PCM requires not only a minimy of app 11.8 -12.2 volts it also needs the proper amperage to function properly..
07-09-2008, 03:37 PM
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thats what i figd, ive checked all the vacuum lines and they are all secure and solid...as far as the cam its a mild blower cam 597 final lift with 115lsa. No underdrive just the t-tim....please keep the comments coming
07-09-2008, 04:05 PM
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my car does almost the same thing...some people have said my IAC needs to be cleaned(as far as the almost dying when coming to a stop). i am ordering a cable this week for my laptop so i can look at true info values and see what all of my sensors are doing. I'm pretty sure in my case that i need new o2's though. Try unhooking them and driving the car, im planning on doing that later today or tomorrow.
