dropspace Posted June 29, 2004 Posted June 29, 2004 I have been trying to nail down a problem with my 92 that has so far stumped me. if i lay on the gas the engine will hesitate and surge slightly until the tach hits 4k rpm. then it takes off with a sudden jolt of power. it only does this if you are accelerating heavily (like over 50% down on the accelerator) the problem is more pronounced when the engine has not fully warmed up but still exists at operating temp. it exists at any grade of fuel. i ran 3 tanks of each grade in it with no difference. my car has a new air filter, new plugs, new wires, new fuel filter. the tranny and gearbox were flushed 5k miles ago and the car shifts fine. it has 103k miles on it. i want to take it to a dealer and see if hooking it up to the computer will shed any light on the situation. but I don't want to get suckered into "lets try this out" and have the situation not change. to me it seems like it may be running rich. the only things i can think of are leaks in the intake (which i have inspected and can see nothing obvious) or perhaps the valves need to be adjusted. but thats all i can come up with. any ideas?
SKperformance Posted June 29, 2004 Posted June 29, 2004 Valve adjusting wont cause bogging does it still bog when you put the car in neutral or are driving in 1st or 2nd gears>?
dropspace Posted June 29, 2004 Author Posted June 29, 2004 it has little to do with what gear i am in and more to do with the throttle being open at low rpm's. it will bog in 1st just as much as in 3rd. really bad low end torque. when the tach hits 4k the bogging instantly goes away
SKperformance Posted June 30, 2004 Posted June 30, 2004 I still didn't ask you if it does that in drive. I asked if it revs normal in Netural. I understand what you are saying but in order to troubleshoot a problem you need to examine all parts of the car and not assume anything.
dropspace Posted July 1, 2004 Author Posted July 1, 2004 well, it's harder to detect this effect when the car is in neutral because you have to really stomp on the gas. making the time you are under 4k rpm pretty short. i would have to say that i can detect the hesitation slightly...but the throttle response is fine.
bdonkersgoed Posted July 1, 2004 Posted July 1, 2004 I am having the exact same problem with my manual transmission '92 ES300. I find the problem occurs more often when my fuel tank is below 1/2. When I am close to empty, it bogs even if I don't !Removed! on the accelerator. It is so bad (when almost empty) that my caar bogs after every stop sign, causing my wheels to squak! If anyone can think of a remedy, it would be greatly appreciated! Bryan
SKperformance Posted July 1, 2004 Posted July 1, 2004 bd hook up a fuel pressure gauge and monitor it under load drop try driving in first gear and stomping on the gas
bdonkersgoed Posted July 2, 2004 Posted July 2, 2004 I wish I had a fuel pressure guage . . . or even knew what one was I'll have to see if my mechanic friend ca do this for me . . . Regards, Bryan
dropspace Posted July 2, 2004 Author Posted July 2, 2004 fyi: the bogging still happens when driving in first
dropspace Posted July 3, 2004 Author Posted July 3, 2004 no I am not the issue is the same whether the ect is on or off...except that it does accelerate faster because the engine spends more time over 4k rpm.
SKperformance Posted July 3, 2004 Posted July 3, 2004 i see you changed the wires and plugs i am going to say the rotor is cracked change the cap and rotor and it should be fixed 80% sure it is that as you have a 92-93
dropspace Posted July 5, 2004 Author Posted July 5, 2004 wow, you are truly amazing! replaced the cap and rotor and the problem went away. a $14.72 fix! it wasn't cracked, but the points were pretty corroded. it may have gotten wet at some point in its life... i really appreciate you solving this prob...if you are ever in dallas, i owe you dinner
SKperformance Posted July 6, 2004 Posted July 6, 2004 no problem i have family in fort worth area but haven't been in 10 years atleast. just need to try and localize the problem and see where it goes which is why i mentioned the tranny first glad it worked , now if you could only convince my wife i am amazing lmao
Lex3486 Posted July 6, 2004 Posted July 6, 2004 So not to say that there's anything wrong with the way my car runs, but say I were to clean up my cap and rotor...think it'd run any better? Improve gas mileage maybe?
SKperformance Posted July 7, 2004 Posted July 7, 2004 cleaning a cap and rotor can help but you are removing metal used for electrical transfer which can cause carbon tracking from arcing over enlarged contacts. for $15 by a new cap and rotor and get it 100% in spec and you will get better performance and milage , if needed check your wires and plugs also
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