ok so my motor started doing something weird. All of a Sudden my car lags like crazy. it feels like a slug. its a 98 spec type r motor. it has a victor x intake mani (that im about to take off) and get a stock one. i got new plugs.. just changed the oil. the wires are new.. but today i was driving and i downshifted from 3rd to 2nd . and when i was in 2nd.. i was giving the car gas.. but it wouldnt move. it was barely accelerating.. the rpms rose.. but the car just kind of sound like it was revving high but it was going there. it felt like it something was holding it back. and after i gave it more and more gas . a couple seconds later it just released and my car just goes back to normal. any ideas? i never had this happen before. its done it more than once.


Help please. im begging you!

 

RPM go high and the car doesn't move?
Isn't it a clutch slipping? oO

 

Its not the clutch. the clutch is new. its something with the motor..because it feels super sluggish. its feels like something is clogged

 

You said, RPM go high, but it won't accelerate.
Can you rev the engine in neutral? Do the RPM go smoothly while revving in neutral?

 

yea the rpm goes high.. and then it just lags for a couple seconds.. then it kicks in all a sudden. and yes it goes smooth in nuetral

 

Well, I had this same thing when It would lag and then kick in and it turned out to be my O2 sensor. In my case though, rpms wouldn't go smoothly up in neutral and partial throttle. It would raise to 2500-3000 and then back off loosing all its power, but jump up once i give it more throttle. Try another O2 if you happen to have one laying around.
TPS could be another thing to check.

 

damn i didnt think of that. i will check into that thanks for the help!

 

Hope it helps.
Don't forget to post here when you fix the problem. It would definitely help someone with the same issue.

 

i will forsure. ill comment back if it doesnt help though lol

 

MyDeeCee2 have you fixed the problem yet???

i got the same problem, it revs ok when it is in neutral but when it is in gears it doesnt go smooth espically when it is down in low rev like 2500-3000, it goes worst when then ac is on , but when i rev it high and drive it really fast to 6000-7000 it seems ok .

 

hello bringing thead back from the dead!!!

need help i have the same problem!!!!

 

Sounds like an O2 sensor since it's only a problem when there is a load placed on the motor. Chances are since the OP never posted back, the new O2 sensor fixed the problem.

 

Nice assumption so how does a o2 have control of load for a engine? I woulda tested map TPS IAT ECT o2 is last on list of fuel control

 

Bad O2 sensor = open loop. The O2 sensor doesn't control load it controls fuel based on load.

O2 sensor also indirectly determines the air fuel ratio entering the engine. F'd up sensor means F'd up afr which equals shitty running engine. This is providing the ecu hasn't already put the car into open loop.

On your list of sensors the most common to fail is the O2 sensor. MAP sensors don't often go out on our cars. Oem TPS sensors almost never go bad. I can think of one that I've seen in the last 10 years. I highly doubt a bad IAT sensor would cause this. More often than not the only way to tell when they go out is the CEL code that results. They do more in cold start situations than anything. ECT is only going to make the car run slightly rich if it goes out and thinks the car is cold all the time; which again will not result in the problem the OP is describing.

 

I would first try a new coil pack. That could definitely be the problem. If I were you I'd give it a whole tune up. New coil pack, distributer cap, wires and plugs. My car did the same thing your car was doing and mine actually ended up being the ecu. Found a cheap one in eBay and my car runs great now.

 

actually?
o2 sensor is the highest priority sensor for determining AF ratio.

 

Just wondering does the car have a catalytic converter?

 

This the exact problem I'm having with my 94 with a b20 swap.



Posted from Honda-tech.com App for Android

 

Not according to my A-8 engine performance BAR issued book. This is the list of sensor influence on fuel control in most efi vehicles. Most or all Honda's are speed density so no maf but the rest are used on most.

Oh thanks 1998 I didn't know what any of those sensors did oh wait I forgot I do. Sensors go out all the time don't know where you get your info on what goes out the most that depends on many variables.

 

IAT and ECT i would check these before ruling the o2 sensor the culprit esp if your not getting a cel . I have the same issues the OP is claiming only i have a cel for o2 sensor that wont go away even with a new one. from reading my FSM your supposed to check your fuel regulator first before getting at checking the o2 sensor if the problem persists. but like most have said it would be the o2 sensor.


my symptoms are lagging before 3k after that its fine, sometimes it bogs when i get going from a stop, backfire when down shifting and sometimes with normal shifting ill hear it pop and rich fuel smell .

so change your o2 sensor if the problem doesn't go away check your fuel regulator,iat,ect then your wiring. oh yeah and grounds.

 

you just keep going by what your book says.
it's common knowledge that the o2 is highest priority. i guess not common enough though

 

Good idea a split diaphragm or hoes to FPR.

If fuel comes out vac line going into diaphragm of FPR you have a needed repair. All of the above should be tested for correct specs

 

Yah people not following things by the book is all to common your a good example of that.

 

you think i was born yesterday? that's a list for load calculation, not fuel perameter priority. under open loop, top priority is ect. under closed, it's o2 all the way.

 

backfiring is usually a timing related issue, among your other symptoms. have you checked ignition timing?