Crit

iTrader: (6)

Since getting my SE running for the first time ever, I've had a mid-high-speed miss of some sort. At 3,000 rpm on the interstate, it'll just hold speed. Any more throttle and it misses badly. It sounds like fuel starvation, as it's load-related.

I've swapped the leading and trailing coils, and swapped in a coil from a buddy's car with no change. I've double-checked the timing, and it's dead on with good advance.

The injectors were cleaned and flowed just before getting the car running, and I changed the fuel filter the weekend afterward. I've checked the fuel pressure while driving, and it's up around 40 psi, all the way to (a very slow) redline.

I pulled the exhaust off the car (2 precats and a muffler) and it still died around 3,000 revs with no backpressure, though I was convinced I'd find a clogged precat.

It feels like fuel starvation, but I know I've got good fuel pressure. I'd like to disconnect the return line and see if I get the correct flow rate through the fuel rail, but there's no spec in the FSM. Any ideas?

bugman1973

maybe something with the airflow meter or something with the emissions system hooked up to the SE like the ones between the 5th and six port actuators or the bacv maybe even the six pot actuators sound a lot like clogged exhaust though maybe something worse.

yetterben

My money is on afm!

Crit

iTrader: (6)

Yeah, I forgot the electronics. I've bought a spare ECU, TB, AFM and airbox on eBay. I've swapped the ECU with no change, swapped the AFM with no change, and all the resistances on the AFM check out to the FSM.

I have an NPT joint on the inlet to the second precat, and it's connected to the aux ports. Even if the ports were stuck closed, the car gets slower, but I don't think it's THIS bad. The car really won't redline in second, as it misses so bad that it just can't keep the revs up. It'll miss in any gear if given enough throttle.

RXnos1200

iTrader: (24)

tps adjustment, temp sensor on back of the waterpump housing going bad..... few things to check. good luck.

bugman1973

yeah i forgot about those try the code reader test light that would help

j9fd3s

iTrader: (3)

i had one that turned out to be the fuel filter internally rusting itself shut, it was aftermarket.

1. coolant temp sensor?
2. theres a little fuel filter in the pump inlet
3. does the throttle body actually open all the way? the secondary "choke" plates like to stick shut.
4. ive seen bad plug wires do this too, and they were RB wires, so it was the last thing i checked

RacerX7fb

Check the gas tank to see if the fuel is clean and the pick up isn't blocked. Also look at the harness and see if the connectors to the injectors are seated well.

z-beater

Have you ohm'd out all the spark plug wires? I had hesitation above 4k once and that was the reason.

RxFred

I had a problem that was similar and cured it by lubricationg the door in the air flow meter, It would not move properly with the increased air flow therefore tricking the computer in thinking no air was coming, so no additionnal gas was injected. Just undo the afm and lubricate. I used pl100.

hella24

iTrader: (8)

I had a similar problem. I had rust/ debris in the fuel tank. My se had a cone shaped fuel filter inside the fuel line / metal fuel pump inlet line itself right before the pump. This filter was collecting the fine particles. The car would run and drive fine until you tried to wind it out at higher rpms. Like others said there is a filter in the tank on the pickup also along with the large external filter.

Rx Seven

iTrader: (12)

I was also thinking about the TPS.

But also tell me if I'm wrong but do the gsl-se suffer the same problem that the FC's have with the 3000rpm hesitation? And also do they have similar grounding issues?

hella24

iTrader: (8)

Second gen rx7s have a 2800 rpm stumble where the secondary fuel injectors come online. A gsl-se only has 2 (much larger) fuel injectors instead of the 4 smaller ones in second gens. The tps only works in part throttle positions. Once you get past part throttle (maybe 20%) the tps sends the same signal.

Crit

iTrader: (6)

Hella, tell me more about the in-tank filter. I know that modern drop-in pumps have a sock on the end, and that the SE pump has a strainer on the infeed, but the in-tank filter is news to me.

On a side-note, I had all my metric wrenches and sockets stolen, so I'm only now able to work on the car at all. I hope to clean up the shop tonight and wrench on the car tomorrow for a short while. Thanks for the help, guys.

rearviewmirror

TPS adjustment, mine had some odd behavior on the highway until I adjusted it.

hella24

iTrader: (8)

I may be mixing gsl-se and second gen in tank filters up. It has been a couple of years since I had the debris issue in the gsl-se. I have had the same issue with second gens. I will look to see if I have a gsl-se assembly out of a car to make sure. I shouldn't be replying to questions while watching basketball! Sorry for the confusion. Check the ohm readings on your tps through its range like other have suggested.

dbragg

iTrader: (7)

my money is on the gas tank

Anex 570

Start looking for a gastank replacement. Personally, I'm going to retro-fit a nice conditioned 2nd-gen gas tank into my car. The other thing you want to look at is the ignition/distributor ect.

hanman

Well, at this point you will have to check everything. But, I have a hard time believing it to be a plugged fuel line, if you are getting good pressure to the engine. I think I would check the pressure going back to the tank and see if the regulator is working ok.

Other thoughts:
I would clean up the fuel injection ground over by the oil filler tube.
Definitely check the dizzy cap/rotor.
TPS on the SE tends to get out of whack easily.