Surging/Thrusting Problem Under Acceleration

Have you eliminated the fuel pump/pickup?

 

its a brand new walbro 255… 3 months old, tops

 

Ive been in SC 2nd gen and that's def not normal. When you get on it, it gets going. Unless your leafs cant handle the power. Im thinking axel wrap/wheel hop is the issue here. Traction bars will do wonders for you im guessing .


And Procomp uses lift blocks in a lot of their kits. Blocks make it worse.

 

i sent my valve body off to level 10 to be modified… is it possible it could be the valve body not working properly causing my surges and whatnot? almost like its getting caught between gears. valves not opening and closing at the proper moments? i might be talking outta my ass, but i gotta figure out what the hells going on...

 

My 2002 TRD Tacoma V6 with supercharger was having surging under load only during closed loop operation as well and seemingly occurring around 3k rpm. I somehow stumbled on this thread...


I took a look at the cats and found the front cat honeycomb had sperated from the body and crushed about 2\3 area from the end of honeycomb where the cat necked down. New cat and surging is gone. Seat of the pants also make me think I got more power!

 

Don't mean to necro-post..lol.. But my truck started having the exact issue the OP posted, and thanks to this thread, I'm gonna start with the cat.. It's an '02 with all original exhaust, 162,000 miles, so I think it's safe to say the CC has had it. I'll update after the repair to further help others who will eventually experience the same. Cheers.

 

Thanks! I'll try that. I have some other stuff to deal with first (Time for a timing belt!) and gonna install some new coilovers I just picked up. I see you've since moved on from your first gen and on to a second gen (or maybe you have two?) Thanks again for the post and information. This is why forums are awesome!

 

Any updates, just got an 01 and started doing this

 

I meant the dude above my post

 

I’m having a similar issue as OP. Truck surges going uphill (only at a certain throttle position) Ive checked vacuum leaks. No codes, I do have cats. Full throttle no problem it’s only at a certain throttle position while accelerating.

Any information helps

2005 Tacoma 4.0l

 

I knocked the cats out months ago because they were clogged. O2 sensors are good. The one behind the cat I have tricked so it doesn’t throw that code. It’s only at a certain throttle position during acceleration

It has a k&n intake I’ve checked for leaks with carb clean.

My fuel trim is high 8-15% long

I don’t think it’s the fuel pump because when you romp on it it’ll go without a problem.



Note: I have a high flow cat welded further back in the mid pipe.

Edit: now that I’m thinking about it when I use cruise control when it has to accelerate it goes ape shit and shifts down super low to get up to speed. Like say you slow down to 80km and you had it set at 100km it’ll down shift to 4-5k rpm

I’ll throw my old maf and order a tps

 

It does sound like the shift patterns are screwed, its Very possible level 10 gave you the stick, they did this to Gadget. There’s a company Gadget uses for auto trans racing applications and it’s in AUSTRALIA, Level 10 has screwed MANY customers I don’t trust their work. Call URD and ask Gadget he’ll tell ya who you can trust. The Debbie Downers that existed here years ago made him not post here anymore, that really sucks because he knows his shit. You could always get a full built auto transmission for high hp Supras they go for around 2k. I’m buying one when I get my charger and skipping the valve body upgrade ,it already has it and isn’t much more. Flush with a few atf changes it can help, if it doesn’t, I’d pull the valve body out again.

 

What's up guys? I've been reading this whole post and every other thread that it links you to. And realize it's been awhile since y'all were trying to run down this problem. But I think this is the best place to ask my question anyway, so I hope y'all will see it. My truck started surgeing today. Doest matter which speed or rpm. But I can be driving at (let's say 60) and with my foot steady on the pedal ( not pressing or releasing) my truck will pick up speed ,like up to 65. It will do it at slower speeds also. Now I was fighting with an irratic idle a couple weeks ago. I had replaced the TPS sensor about two months ago and didn't think that was it. But apparently it was . Cause I replaced it again two weeks ago and it cleared up. Now when I say erratic idle, I mean once it's warmed up to operating temp, I can start it and it might idle at 1000 RPM and the next time I start it it might be at 700 RPM. It's like it resets every time I start it. Every time , in-between 1200-700rpm. I heard a bad TPS would cause it to surge, but I just changed it two weeks ago. Now I did just read somewhere on this site that if you get a aftermarket TPS that it would only last a couple months. That would account for the first one I replaced two months ago. But this one was a Toyota TPS with the correct part number. But I did get it on eBay for 12 bucks. U think those are fake? And also I was flushing out my heater core the other day and might have gotten a little water on it? I put a plastic bag between the outlet and the TPS but noticed there was a little water on it. My truck is a 98 taco 3.4 with 235000. I did the plugs and wires from the Toyota dealership. Cause the plugs were on 15 bucks and wires were about 60. Did both them about two months ago. The first TPS threw a code but the next one didn't. So I don't look for the check engine light to come on when anything goes wrong, cause it don't. A week after I did the plugs, I was driving home from work 200round trip, and my truck started missing, it was raining and I had done the deck plate mod and forgot to put the lid on and thought I got water in it. Didn't do it on the way over, just started on the way back. And about halfway back it wouldn't hardly run. About 60 , and when I pushed the gas pedal down just a little more it would really miss. Then as I got almost home it started running better, but would still miss. When I got home I started in . I pulled my air box and filter ( I was alittle damp) and pulled plugs. #6 plug was ok but #3 was broke and #1 was broke. . U could spin the top and it would spin all the way through. The whole middle of the plug was detached. And not a dam light came on the whole time. So I don't rely on it all the time.Also did someone say that the denso plugs from the dealership were junk? They tried to tell me that I broke it putting it in. I call bullshit on that. It's definitely possible if you don't know what your doing or use an impact. Should I overpay for a New TPS from the dealership or the eBay ones that have the correct part number ,OK? It was raining this morning and it didn't do it on the way over there, but started surgeing less than 5 mins as I started back home. But the first thing I did this morning was put the deck lid on. After reading all of this ,I'll look at my wires and make sure I don't have a short. I know they are crossing over each other but I made sure that they crossed where there was that extra insul. And I took out my plugs when I got home and they are ok. I went ahead and cleaned my MAF . WAS there a way to reset ur TPS? Did I read somewhere on this form that u could unplug it while ur truck was running, then shut it off and plug it back in? Where it would reset the TPS only. Unlike unplugging it battery to reset your ECU. Sorry so long guys. Just want y'all to get the whole pic. Let me know from experience what uve ran into?

 

Oh forgot to mention. I did think about it being bad gas. But when I filled up last night I also put in that marvel mystery stuff. Isn't that like seafoam, to where it would take the water out or atleast help it burn, if there was any bad gas? I got the truck about six months ago, and don't know about it's past, so every dime I can get I use it on pm for my truck, cause she's all I got. I've put 20000 miles on her and the only unforseen problem I've had was that it started to overheat about a month ago coming home. Had a bunch of rust in it. Saw that when I first got it and replaced the coolant, just didn't know how hard it was to get it all out. Cause two weeks ago it did it again almost in the same spot. I caught it before it got to the red. Pulled over and popped the cap and let it shoot all that rusty crap out. Pulled the thermostat and put water and casscade in , drove it home and spent 3 days of flushing and driving and flushing. Clean as a whistle now. That's why I was flushing the heater core now. I bypassed it for awhile to rule it out, while I was making sure it was a stopped up problem and not a head gasket. I had checked the water pump and changed the thermostat. And I wasn't loosing coolant. Also did that isle tester, for gas in the coolant. So I think I got that issue solved.Hopefully!! But I just can't stand it when something is not right. Especially when I'm a hundred miles from home, and usually broke to where I can't get a wrecker. And don't have anyone to call. So I got to keep her running good.

 

Yea my 03 surges on accell sometimes when i give it a good throttle. Betting it was the cats before i read this forum so points me back in that direction. Only shitty part is nee cats have gone up like 4 fold these days.. might just cut em out and get rid of em..

 

Yeah, your right, it definitely could be the cat, but it should throw a code if it was. I know that they dont always throw the 02 sensor, but most of the time it will. I took a long drill bit and drilled some holes down through mine so that it would flow good,and hoping it wouldn't throw a code and it worked perfectly and has been for two years. Of course this was before the big metal splurge. Cause now i would take it off and sale it before i just drilled it out. But since he didn't say anything about throwing a code, then im leaning towards fuel.

 

You know now that im thinking about fuel, ill be damned if i didnt put in most of a can of seafoam with only 1/8 a tank of gas and when i went to fill up i only put under a half tank in it because America and i bet that may have something to do with it.. im still on that same half a tank because i don't drive that far for anything ever so have had the surging for a while which made me not think about fuel. My old truck would drink the stuff so if it had bad gas itd fart it out in a half mile and be done with it.. im gonna go sell a kidney, give blood, sperm and whore myself out to fat chicks then put that money in a full tank then see if i still have issues, other than the mental trauma from the things i had to do to afford a full tank... :/

but fyi you dont get a lot for cats really.. only for certain cars like prius or something with a big ass tri stage 100lb booger.. normally theyll only give you maybe 40 to 80 at most at the scrap yards unless you got one of the huge cats then youre looking at close to 300.. and plus nowadays you have to bring 2 forms of id, the registration or title of the vehicle it came off of plus if your in a gay state like california then they require a emissions recertification after the removal of the cats.. crazy over there.. luckily i live in Ky where you can strip down a car to frame and motor but as long as you got a seatbelt, lights and registration you can do what you want..