WOT, low rpm, high gear hickups

[Lex]

Well, there are some small nitty gritty things I want to figure out and was wondering if you guys had the same experiences. Im running full GTX motor, BP55 ECU, 5spd na TPS

Sometimes, esp when the car is cold, if I stick it in 4th at about 1500-2000 RPM and floor it, it will sometimes have these small hickups ... no big bogging ... nothing to slam your head on the windshield ... just small hickups. My A/F gauge indicates rich throughout.

Could it be my distributor going? Improper spark gapping?

Sometimes it will do it, sometimes it won't - it seems to especially do it when it's cold.

Anyone seen this before?

[Lex]

I would have already, but the TPS on my GTX motor was broken when I got it. It's also tough to find a throttle body for an auto BP around here and they rape you for one at a junkyard if you found one. I see LX proteges very rarely.

The intermittency of the problem however leads me to think it's not the TPS signal - otherwise it would be happenning all the time.

[atomicEGT]

do you have new plug wires?

[Lex]

nope, do not and they are made of 2 mismatched sets

[lscrx]

If I get an auto TB from my u-pull-it will you buy it? I'll only charge you what I pay for it plus s&h... just let me know so I don't pull one for no reason They had an automatic LX last time I was there but it may be gone for all I know.

[Lex]

EDIT 2: lscrx, let's not do the throttle body until I am sure that is the issue. Thanks though

lscrx, sure that would be awesome. I'm not sure if the clips are different for the 3 and 4 wire ones (I am assuming they are), so can you please also get the clip and cut the wires so I can just solder into my existing harness.

Thanks!


EDIT: If it's more than $75, let me know, that would be a lot

[neuspeedescort]

if you want to swap your t/b out you will need the whole engine harness. that is not your issue. your tps may be bad but that doesnt mean you need to swap out to the auto tps t/b. what is your boost gauge readign at idle? should be 18-20hg. what is your ign timing at idle set too? try turning it to around 10-11 advanced. i don't know what the deal is with this bp55 ecu i have never heard of it til about a month ago. im running the bp26. which is the j-spec ecu. i hear the 55 is a euro ecu. is that the same as the aussie one with the 10 less hp?

NEUMAN

[Lex]

Okay, so lscrx let's hold back on that TB.

My boost gauge is connected to the wastegate so I dont see any vacuum. I have to connect it somewhere else. Is the BOV line from the intake manifold a good place to T?

My timing I left untouched from when I got the motor until recently where I advanced it very little to make up for the lack of knock sensor. I didn't notice any real difference in the way the car drove.

The BP55 ECU is the Euro spec one. I don't know if it's rated for less power or what the deal is with that. There is a lot of confusion about this issue. The car certainly feels slower than it did with my NA ECU.

if you want to swap your t/b out you will need the whole engine harness. that is not your issue. your tps may be bad but that doesnt mean you need to swap out to the auto tps t/b. what is your boost gauge readign at idle? should be 18-20hg. what is your ign timing at idle set too? try turning it to around 10-11 advanced. i don't know what the deal is with this bp55 ecu i have never heard of it til about a month ago. im running the bp26. which is the j-spec ecu. i hear the 55 is a euro ecu. is that the same as the aussie one with the 10 less hp?

NEUMAN

[atomicEGT]

nope, do not and they are made of 2 mismatched sets

replace them. make sure you use the grease that comes with them.

[atomicEGT]

if you want to swap your t/b out you will need the whole engine harness.

you're joking, right?

i'm running a 4-wire on the mtx harness...

[Lex]

atomicEGT, do you have it wired into a GTX ECU properly? Any issues?

[atomicEGT]

i'm using an n/a ecu.

[Lex]

So what would be the advantage of using a 4-wire TPS on an NA ECU unless it was an auto

[atomicEGT]

So what would be the advantage of using a 4-wire TPS on an NA ECU unless it was an auto

it's wired to my s-afc and wideband controller for datalogging

[Lex]

and the car runs without hickups? Im surprised.

I removed my TPS signal wire completely and don't have anymore hickup problems.