What's up peeps. I got some boggin issues with my car.
It's not throwing on the SES light and it's running like dog crap. It's not the stutter that you would get if a spark plug wire was disconnected or anything like that. It is a constant deep bog that is seriously robbing me of power. A chevette could beat me off the line right now. It was doing it last night so I reved the engine to about 3k and all of a sudden I smelt something funny. I looked under my car and the whole exhaust system was glowing. I mean really glowing. very bright. even my muffler was glowing. It bogs at idle, it bogs in drive. what could be wrong? Like I said. no codes.

 

sounds like a clogged cat to me

 

the cat was purchased in march. since then I threw a rod in my old 5.0L I put a new motor in and it was running fine until this.

 

well I disconnected the cat. Still boggin so it's not the cat. thanx but, keep'em coming.

 

A MAF sensor will cause this, don't think you have one though. If it was the Cat Conv it should only be that hot before the Cat Conv.

 

nope I don't have a MAF. But, I do have a MAP and it's not throwing any codes...then again, if it's faulty it may not throw codes right?! either way it's not the cat.

And I just replaced the TPS today because I was getting a code for that. But this problem was existant before the TPS. I thought it may have been the TPS because the TPS is supposed to tell the ECM what to set the injector rate at. I figured if it is letting the injectors stay open too long then that would cause the problem. y'know floodin it out. bottom line is it started boggin, i had a code for the TPS, I replaced the TPS and got nothin.

someone suggested the cat. I ran outside and disconnected the cat. still nothin.so we know it's not the TPS or the cat. maybe the IAC?

I really appreciate this guys cause I need my car for work. I use it for work and I need to find a remedy by Wed. Keep'em comin

 

Well, if your exhaust is literally glowing, then I don't think it would be your iac. IIRC, glowing exhaust is usually bad timing, i.e. the distributor cat is 180* backwards. I could be totally off on that, but it may be worth it to check your base timing again. If you have winaldl, definetely use it to see what your blms are at. I don't think running rich will cause your problem (as far as glowing exhaust goes), but running lean could as I believe lean conditions can burn up your valves which in turn would reflect on the exhaust possibly

 

well you can only install a cat one way and if the dist. was 180 off it wouldn't even start.

I should also mention that condition would happen every now and then. In other words, it started happening about one month after I installed the new motor. it didn't happen again for quite some time. It would bog out for just a few seconds and then clear up and the car was all *****. but, about a month ago i noticed it would start boggin on hot starts. cold starts it would fire up, and run fine but, if I shut it off and tried to start it again it would bog for a few seconds and then clear up. but, even this didn't happen all the time. sometimes I'd fire it up on a hot start and it would be fine. never threw out a code though.

Unfortunately i don't know what a winaldl is. I know what an aldl is but, not a winaldl.

 

I meant distributor cap, not distributor cat

 

oh well there is only one way to put on a distributor cap. if you have the old HEI with internal coil, there is a little stub on the inside of the cap that fits into the slot cut out in distributor face.

and if you have an external coil:
carbuerated is the same little stub
TBI however has the module facing outward and because of that again there is no way you can install a distributor the wrong way.

That's just FYI

However you can install an entire distributor 180* out.

Anyways, I hope many people view this thread as I have figured out the problem and it is one of those problems that could really puzzle the crap out of someone.

In this case I opened my Air Filter housing and just for fun I took a look down my TBI while the engine was running and found to my amazement that one of my injectors has stopped flowing. It cut out all together. This would probably explain why it happened every now and then at first and then frequently on hot starts. injectors pulse rate depends on the temp of the engine so it was failing on lower pulse rates until it crapped out all together.

I will replace the injector tomorrow and post the results here for everyone

 

Keep the symptoms in mind in case this ever happens to you.

bog at start. clears up after awhile. every once in awhile.
starts bogging on hot starts.
starts bogging on every start.
critical loss of horsepower.
exhaust glows when revved at 3500-4000 rpm's for about 45 sec.

Thanx for all your help guys. I hope this fixes the problem. I poured a little fuel down the side that wasn't working and the engine revved up. When I opened the throttle and sprayed fuel at the same time, there was no more bogging.

Again thanx alot and I hope other members find this useful.

 

I've always had bogging problems with my car, but it's carbed (stock QJ), and nobody has been able to figure it out. I've had it to three different mechanics. I'm having a 350 built soon, so my bogging problem has taken a backseat to that.

Could it be a problem with the carb itself? I have all of your symptoms, except the exhaust glow. Any suggestions would be greatly appreciated!

 

Do you have an electric choke thermostat?

 

Damn man, that thing was running scary lean to make your EGTs that high. I wonder if maybe the leanness caused the ECM to pull max timing for knock retard and that, plus lean-ness caused the high EGTs.

 

holy ****! You better hope you didnt burn any valves or damage the pistons.

On a side note, maybe those stock injectors arnt as tough as i thaught... Ive always beleived they could never be killed and after seeing a couple of threads about them crapping out i dont know.

 

winALDL is a godsent and JoBy is the man for making it. You would have probably seen this problem far in advance if you had the data logging software. It and other data logging software is a must with a non-stock setup. Do a search for his SN above and in his sig youll see a link to his site.

 

LOL - I pulled the last invoice from when it was in the shop, and sure enough, under recommendations:

Replace choke thermostat

It was faded, and under some unimportant items...that's what I get for not being thorough. Thanks a bunch dude!

 

no problem. I figured that was the case. if you need any further assistance on how to change it feel free to email me at 91rs4life@comcast.net
there are a couple of things that should be considered before changing one and I want to make sure you have the adjustments good to go when you do it.

and as far as pistons and valves and stuff... car is runnin like a champ. I only drove it to go get the new injector once I realized it was having problems. on the upside, I bet my valves have almost no carbon on them now. lol.

 

I wish it were as simple as a lean condition with my RX.. could be anything with one of those thanks to the rotary EGTs being high enough to cause combustion on their own anyway.. actually damn near burned the car down with the exhaust.. lean? Could be.. Rich? Yep.. Dead apex seals? Yep, if one rotor's down, the good one will light up the bad one's charge in the exhaust.. grr.

On the bright side, timing is a little harder to mess with

First order of business, though, is roughly the same as yours was, though.. gut 3 cats and try again (after I compression test.. if that fails, well... heh. anyone have a friend with a spare 13B from a second gen RX7?

 

someone today tried to tell me that a dead injector wouldn't light up my exhaust... So after I stopped laughing at the guy, i explained to him how 4 cylinders were just pulling and pushing good air. I also tried to explain to him how this fresh air in my exhaust would help to get it glowing ( y'know just like a fire needs air to keep lit ). He says it's the cat. even though I told him it doesn't do it anymore after I changed the injector he still insists it's the cat.
Sooooo, I want to get this straight, if the cat is clogged, the exhuast system will glow from the cat back or just the cat.

I know this wasn't my problem ( for obvious reasons ) but, also my exaust started glowing in the merge of the y-pipe, before the cat.

 

I've been having all the same problem with my 88 LO3 execpt glowing exaust. Turns out the fuel pump is bad. 5lbs pressure priming and only 7 1/2 lbs running. might check fuel pressure also as I got a bunch of related codes but not anything pointing directly to the pump.

 

Tough? well, everyone has different definitions on what tough is. Let's just say that this injector lasted 12 yrs and 132,000 miles before going bye bye. I'd say it ran it's course.

 

i always thought that they were practically indestrictable but now i guess theyre just merely really durable instead.