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[NWMO 95 Prizm Lsi]

Hello all,

While it seems the new TPS has helped some aspects of the hesitation problem, there is clearly something else going on. No codes at this time. I am hoping to pull the plugs tonight to take a look.

I am thinking it may be good to try some injector cleaner with the next tank of gas. The local dealer has the "Toyota" cleaner with butyl cellosolve being the main detergent. What has been the experience of others here on what to use, if anything. While the "Toyota" treatment is more expensive ($9), if it works better, I don't mind. Most of the other treatments appear to use different detergents with little or no butyl cellosolve.

I'm not trying to open a can of worms, but am curious what others have found and I would like to try it if it may be beneficial. I can see where a partially clogged injector might do OK with acceleration, but get puny when the opening is shut down to simply maintain speed (which is where I notice most of my difficulty).

TIA

Chris

[NWMO 95 Prizm Lsi]

Hello again,

Here are the pics of the plugs. All were gapped well, were NGK BKR5ES and were tan to whiteish in color. My manual calls for NGK BKR5EYA or equivalent. Is the ES an equivalent?









I tried to check the plug wires, but my Fluke VOM only registers to 400 ohms, so nowhere near what I needed to check the wires.

Chris

[speedy25]

Your plugs are excellent and dont require replacement. I've never heard of a YA electrode. S has been the standard one for YEARS.

While some injector cleaner may help some but I dont think you have found your problem yet. Since you get no codes its NOT an electronic fault, but a mechanical one. Keep checking.

-SP

[NWMO 95 Prizm Lsi]

I assume the ES has replaced the EYA along the line sometime.

Would a slightly clogged injector throw a code? I've read about "dribblers" where the spray is broken, didn't know if it would show up on the plugs or not. I'm driving it daily, so I will continue to study and search.

Thanks

Chris

[speedy25]

A clooged injector could throw a code but it would be for some other symptom like a misfire and not "clogged injector."

-SP

[NWMO 95 Prizm Lsi]

Good evening all,

I ran a bottle of Toyota EFI cleaner through the car, pulled the air cleaner hose and cleaned the throttle plate with carb cleaner and a tooth brush. Cleaned up the PCV valve and looked around some. The only thing I noticed that was odd, was the previous owner had removed the thermal vacuum valve (TVV). I can't see that making much difference, but didn't know if I should get one to put in or not?

As long as I keep the tach below 2k, I can put around town and it runs great. If I run it between 2k and 3k, this "miss" or hesitation shows up. Feels like a very temporary loss of fuel or spark OR a valve sticking open. Can't imagine the last as it would likely occur at all RPM ranges.

I'm continuing to drive it daily and keep looking for what may be causing the problem. On the bright side, I am getting 32 mpg and the tank w/ cleaner was even better. Will see how the first tank does this week, but am quite pleased with the fuel mileage. How does the 1.8 typically do fuel mileage wise?

TIA

Chris

[Steelballz]

with your last post I noticed what my corolla did before aswell, it ran great for most of the revrange except for between 2-2550ish rpm, where it was slightly missing.I gave the engine a full service which didnt solve it, left everything else the way it was and drove it above that revrange.a full tank of petrol with additives to remove the carbon build-up in the engine might help you...

I didnt actually add that in, my corolla tends to backfire often and I can make it backfire at ~3k revs, that was where loads and loads of black smoke came out, and the miss stopped completely.thank god the irish laws aren't too strict and you can go popping flames down the road LOL