Over-revved my SR...

[sbird1]

Now it will only rev to 2K and smells like gas. It stalls if there is no throttle input. I'm about to go to bed and I just wanted to see what people think happened on here. I'm going to investigate tomorrow. I hope it's just a fkd spring or something. I guess I will find out...

[TheOne]

prolly wouldn't happen due to overrevvin, but revvin to 2k type limiter and smell of gas usually = bad/disconnected MAFS.

[clss240]

bent valves ftl

[sebazztard]

how can you over rev with a limiter? if you smell gas and there is no response, im thinking something came loose? hopefully its something simple.

[adrianfromthecastle]

prolly wouldn't happen due to overrevvin, but revvin to 2k type limiter and smell of gas usually = bad/disconnected MAFS.

+1at least that's the symptoms of a bad mafs. Running super rich and stalling at neutral... But usually, bad mafs has a rev limit of 4k, and not 2k..

I'd say try cleaning your mafs sensor with a mafs sensor cleaner and hopefully it was just a coincidence that it happened when you over revved, lol.

[danielsan]

how can you over rev with a limiter? if you smell gas and there is no response, im thinking something came loose? hopefully its something simple.

accidental downshift to the wrong gear. no way a rev limiter will stop that.

[sebazztard]

ah right

[xX RB Xx]

+1at least that's the symptoms of a bad mafs. Running super rich and stalling at neutral... But usually, bad mafs has a rev limit of 4k, and not 2k..

I'd say try cleaning your mafs sensor with a mafs sensor cleaner and hopefully it was just a coincidence that it happened when you over revved, lol.

on an SR MAF it only revs to 2.5k My buddie had the same problem. His maf took a **** on him and it sounds kinda like what yours it doing.

[sbird1]

Thanks for the good info. I'm going to go grab some lunch, then I'll try to clean the MAF. I just pulled out of a parking lot and gunned it a little too much. I hope you guys are right about it being an MAF. I don't really have money to fix anything more serious...

[White Comet]

my first tought was mafs as well, btu since it was overrevved thats probably not it

[s14s14s14]

another great thing about djetro no more mafs hopefully its just a dirty mafs good luck dude

[sbird1]

Ok, so I just messed with the MAF. I just played with the wires for a sec and then tried to start it. It starts, maintains a 1K RPM idle and does not die, but it is pumping out smoke (didn't note a color in hindsight) and it sounds awful. It has a brand new HG (Apexi) so that can't be the problem. Does it still sound like a bad MAF? I'm not allowed to work on the car in the parking lot, so I can't even take the valve cover off to see if there is anything obviously wrong. It doesn't make any strange sounds, it just sounds... bad. I guess like it's running rich. Any more thoughts?

[White Comet]

unplug the mafs and start the car. it it sounds the same you need a new one or it needs cleaned

[dickie]

smoke could be burning off gas, it could also be messed up valves.

[sbird1]

It sounds better when I unplug the MAF. The smoke is definitely gas. I think the MAF is my problem... anyone have an extra SR or Z32 MAF? I may upgrade since the time seems to be right.

[sideslider]

take off ur valve cover and check ur rocker arms

[clss240]

i'm still thinking you got something more wrong than a maf. will they allow you to pull your plugs and compression check? still going with my original guees @ bent valves

[urcaptnspeaking]

by how much did you over rev

[nstabl]

how bad over rev. like 2nd instead of 4th while racing or just a simple 3rd to 2nd while cruising?

[sbird1]

I don't know how bad I over-revved. I was listening but not looking. I just gunned it in first gear. I think I only revved to about 7500. I dont have a compression tester or anything. I think I'm going to go take the valve cover off and to hell with stupid apartment rules. Alright, here goes.

[urcaptnspeaking]

I wouldnt figure 7500 would kill it, but I have been wrong before, that and I dont know the Sr's redline...

[HeckYes]

It sounds better when I unplug the MAF. The smoke is definitely gas. I think the MAF is my problem... anyone have an extra SR or Z32 MAF? I may upgrade since the time seems to be right.

i have a z32 MAF. not sure if it works never hooked it up but its yours if you want it. IM me if you want it

[spooled240]

check for leaks in your intake and your intercooler pipes. A blown pipe or a leak (even a small one) can make the car run funky and not want to rev.

[jeff420]

check for leaks in your intake and your intercooler pipes. A blown pipe or a leak (even a small one) can make the car run funky and not want to rev.

i second that. my car was acting similar to what you decribe and it ended up being a leak in the intake after the maf.

[keith0486]

i had the same problem and it turned out to be a big boost leak.

i was running the stock intercooler that had the bov just off of it that was moved up to the engine bay and the guy that had the car before just put a plug in the hole.

thats what i think it might be boost leak.

[TheOne]

the ecu will go into limp mode if the mafs is bad/disconnected, and it'll hit a ~2.5k rpm limiter(+-500rpm), not 4k limiter, that'd be something else(like bad timing)

like other people have said, it could just be a boost leak, that'd give ya almost the same results as a bad mafs.

[sbird1]

Ok, so I took the valve cover off today and there is nothing visibly wrong in the head. If I can get it somewhere or have someone come to me, I'm going to compression check, which will HOPEFULLY come back fine. I will let you all know what I find as soon as I know. Thanks for all of the help and advice.

[sbird1]

Sorry for the double post...

check for leaks in your intake and your intercooler pipes. A blown pipe or a leak (even a small one) can make the car run funky and not want to rev.

That was my first thought. I expected to open the hood and have one of my intercooler pipes popped off from too much boost, but alas, I may have to dig deeper. I have a GReddy FMIC, so I expect it to not just develop a leak just boosting 15 psi. Just thinking out loud, I need to check the plugs where I blocked off the stock recirc. So here is my plan:

1) Compression test

2) Check for boost leaks

3) Try and figure out the condition of my MAF

[spooled240]

that sounds like a plan, but make sure you look closely for leaks a hairline gap can still make a difference.

Do you have a boost gauge? How is the spool? A leak will cause lag.

[sbird1]

Hmm... that sounds likely as my spool has been poor (about 4.5K to full spool) just on my relatively small HKS GT2540.