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Had my first problem with my car tonight. Basically, i was driving all night with no problems. Car ran great, it was like 43 degrees outside, and slightly humid, but car ran great. I was leaving a place later in the night, and gave my car about 75% throttle in 2nd gear, and it studdered a bit, although it kept accelerating, but slower. I found this weird, and tried it in third, and it studdered again when i applied anything over 75% throttle.
So i started doing tests. Here is what i came up with:
Symptoms:
Car studders under heavy load (approx. 75% throttle or more in any gear.) Feels like a miss, or something to that nature. More throttle i give it, the more it 'misses', and sometimes i even get a backfire.
What i did to test this problem:
Ran it slowly up through the RPM's in each gear. No studdering.
Gave it about 50% throttle in each gear, and no studdering.
Only when it is 75% or more, it 'misses'. It is more noticable in lower gears (i.e. first its noticable, 2nd you can notice it even more, 3rd it really studders, and 4th does the same (didnt try 5th)).
I put it in neutral, and went under the hood and used the throttle to run it up through the RPM's while just sitting there. No miss at all, so this only happens under a load. (i did NOT try to quickly run it up through the RPM's with the car in neutral)
What i think it could be:
1) Coil packs? (70K miles, and they are probably the original coils, but i would think the miss would be constant, not only under load)
2) I washed my car today, including the engine. There was water all over the place. Possibilty that water got into something? (BUT, it ran fine right after i washed it, and for like 6 hours after i washed it, it was also fine.)
I cant think of anything else.
Help in getting to the bottom of this is fine. Im going to check the car tommorrow morning and see how it runs, and ill post back. Thanks to anyone who replies in advance.
Car: 1996 Camaro 3800, M5, only mods are Borla, 3.42's, shifter, thermostat, and some suspension stuff.
[ February 23, 2004, 05:12 PM: Message edited by: Ian ]
So i started doing tests. Here is what i came up with:
Symptoms:
Car studders under heavy load (approx. 75% throttle or more in any gear.) Feels like a miss, or something to that nature. More throttle i give it, the more it 'misses', and sometimes i even get a backfire.
What i did to test this problem:
Ran it slowly up through the RPM's in each gear. No studdering.
Gave it about 50% throttle in each gear, and no studdering.
Only when it is 75% or more, it 'misses'. It is more noticable in lower gears (i.e. first its noticable, 2nd you can notice it even more, 3rd it really studders, and 4th does the same (didnt try 5th)).
I put it in neutral, and went under the hood and used the throttle to run it up through the RPM's while just sitting there. No miss at all, so this only happens under a load. (i did NOT try to quickly run it up through the RPM's with the car in neutral)
What i think it could be:
1) Coil packs? (70K miles, and they are probably the original coils, but i would think the miss would be constant, not only under load)
2) I washed my car today, including the engine. There was water all over the place. Possibilty that water got into something? (BUT, it ran fine right after i washed it, and for like 6 hours after i washed it, it was also fine.)
I cant think of anything else.
Help in getting to the bottom of this is fine. Im going to check the car tommorrow morning and see how it runs, and ill post back. Thanks to anyone who replies in advance.
Car: 1996 Camaro 3800, M5, only mods are Borla, 3.42's, shifter, thermostat, and some suspension stuff.
[ February 23, 2004, 05:12 PM: Message edited by: Ian ]
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