Yesterday I noticed a weird issue where the car would seem to have a very short loss of power, usually between 2000 and 3000RPM. The point at which it lagged changed occasionally, and was not always evident...
The other funny part is, that I could floor it and miss VTEC in first...or it was very slight. Once I hit second gear, VTEC was just fine. Once again, this only happened occasionally.
I checked my oil level, halfway between the two dots. However, the oil is going on 5000 miles and several months.
I had this problem once before (Without the VTEC problem, which may have been low oil along with tight turns reducing pressure below the threshold) and resetting the ECU fixed it for about a week.
Obviously I will fill up my oil, and probably change it the next few days. My question is, if resetting the ECU fixes whatever gives the car a little hesitation...should I just install the OBD2 Bypass and call it a day?
Drew
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Another world....Another Time...This land was green and good...until the Crystal Cracked. Once more they will replenish themselves, cheat death again, the power of their source....The Crystal...
Interesting that an OBDII car is getting this problem now also. Search for hesitation, there are PLENTY of us with is. A guy just posted today in 4gen about his.
I think it's an H22 problem really...and I suspect something with fuel delivery...either too lean or too rich.
The funny thing is my hesitation point seemed to jump around, and an ECU reset fixed it. Hopefully an OBD2 workaround will allow me to avoid the problem for the short term
Drew
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Another world....Another Time...This land was green and good...until the Crystal Cracked. Once more they will replenish themselves, cheat death again, the power of their source....The Crystal...
Originally posted by BlueShadow Read the responses I posted on this thread in the natural aspriated forum. Maybe it is the cause of your 3K hesitation problem.
I've read all the hesitation threads, even the GIGANTIC one for 4th Gens
But yeah, fuel pump sounds right...but then why is it not noticeable on new cars or why does every car NOT have this problem?
Heh, I wish I could get a nice EMS setup. My plans were to do the OBD2 workaround and probably a VAFC someday to try to tune it out of there...
Has anyone tried this? Does hesitation show on a dyno if it's usually just part throttle?
Drew
__________________
Another world....Another Time...This land was green and good...until the Crystal Cracked. Once more they will replenish themselves, cheat death again, the power of their source....The Crystal...
I've read all the hesitation threads, even the GIGANTIC one for 4th Gens
But yeah, fuel pump sounds right...but then why is it not noticeable on new cars or why does every car NOT have this problem?
Drew
From what I've read on the RX7 forums, the 3K hes. varies from car to car because of each individual cars grounds. Some cars have good grounds/wiring, while others have bad grounds/wiring.
It sounds like a combination of different things will make the 3K hes. more noticeable. I'm still not sure if the Prelude fuel pump is the cause of it though, I was just pointing out that it might be the cause. I posted the testing procedure on how to check your fuel pump to see if it does have a low and high speed. IIRC, the guys on the rx7club were trying to find ways to get rid of the delay from the low to high speed switch in the fuel pumps.
__________________ Blue
-1989 Ford Probe GT (stock, POS) **SOLD**
-1999 EBP Civic SI (modded) **SOLD**
-2001 EBP Prelude Base (almost stock) **SOLD**
-1993 VR RX-7 R1 (modded, 280 RWHP) **RIP**
-1991 Red CRX DX (built 1.9L B18C, SC61 turbo- in the works)
-1990 White CRX DX (stock, Bronze VX rims)
Every man has his own destiny: the only imperative is to follow it, to accept it, no matter where it leads him. -- Henry Miller
Sweet Blue, it's people like you with the "let's get this shizzle fixed" that make PO what it is
How about an aftermarket grounding kit? My car is a 97 with 75k on it...I bet my wires are in need of replacement
Drew
__________________
Another world....Another Time...This land was green and good...until the Crystal Cracked. Once more they will replenish themselves, cheat death again, the power of their source....The Crystal...
Originally posted by GroverzVTEC Sweet Blue, it's people like you with the "let's get this shizzle fixed" that make PO what it is
How about an aftermarket grounding kit? My car is a 97 with 75k on it...I bet my wires are in need of replacement
Drew
hehehe,
I wouldn't go patting myself on the back just yet, for all I know none of the stuff I was talking about may even apply. But if the 3K hes. problem is in fact the fuel pump, then here may help you. It is a link that is about RX7's, but you can use the grouding walk-thru as a guide to help fix your problem.
Also you could get a premade grounding kit, but you can buy some thick gauged wire and ring connectors and make your own. In the link it will tell you some of the things you will wantto ground. All you have to do is get the proper gauge wire, some ring connectors and a crimping tool and you can ground most of the things in your engine bay.
In addition to the grounding though, you may also want to check your ECU and ECU grounds. It has been said that cars of the same generation might possibly have different versions for their ECUs. I am almost certain that the 93 and 94-95 RX7 ECUs are slightly different, and I think that the 5th Gen ECUs from 00-01 are different from 97-99 (cant remember). In addition to possible differences in ECU firmware, the ECUs self learning process appears to be part of the 3K hesitation problem (for the RX7s anyways). So try unhooking your battery and stepping on the brake for 30-45 seconds to clear the ECUs memory.
__________________ Blue
-1989 Ford Probe GT (stock, POS) **SOLD**
-1999 EBP Civic SI (modded) **SOLD**
-2001 EBP Prelude Base (almost stock) **SOLD**
-1993 VR RX-7 R1 (modded, 280 RWHP) **RIP**
-1991 Red CRX DX (built 1.9L B18C, SC61 turbo- in the works)
-1990 White CRX DX (stock, Bronze VX rims)
Every man has his own destiny: the only imperative is to follow it, to accept it, no matter where it leads him. -- Henry Miller
Last edited by BlueShadow : 09-09-2003 at 07:04 PM.
My car does the same thing and Im going to check out the spark plugs and everything. My car hesitates in the beginning if I drive slow and chill and everytime I shift to the next gear too, but if i floor it n drive it hard, it would drive normal, now it just doesnt hesitate but from 3-4000 rpm, she starts sounding loud like an exhaust leak and it feels like its loosin back pressure n holding back n the rpm's would climb so slow and once it hits 5 for the vtech everything sounds smooth and normal like its supposed to and the car jerks me forward n picks up its speed but as soon as i shift it does the same thing all over again, lag at 3-4 and then BANG, im speedin like a freight train, can anyone help me with this please?
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