Tech / General EngineIs your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!
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I have been having some issues with my car for awhile now, Which include the following:
- Random misfires especially at or around idle
- trouble starting; have to pump gas pedal while cranking despite the fact It's a FI car.
- Hesitation/bogging when accelerator is lightly pressed on cold engine
- Hunting for idle/unstable idle/stall at idle when cold
- Almost guranteed every time code 44 if engine is allowed to idle down for more than a few seconds when cold.
- Every once in blue moon, and I'm talking when the cow jumps over it, it will throw a 44 at idle/while cruising after car has been fully warmed.
Now, I am not attributing ALL of these problems to my theory, but I believe it could be responsible for a large part. I believe It's the MAF (or relay). My car has thrown a code 34 on It's own twice now in the time I've owned it. The first time, I tried driving the car before it had a chance to warm up. An EXTREME amsount of hesitation was present, and 2 minutes up the road it threw a code 34 and I had to pull over and restart the engine for it to run right again.
The second time, was this morning. The second the engine fired up the CES light came on. That's a little early for a code 44 I thought. When I got to work I checked codes and whatdo you know there is good ol' 34.
So, I have two questions for you all. What do you think? And also, on a 1985 TPI where is the MAF relay located. I heard these can at times go bad and cause the MAF to appear bad so I'd want to replace the cheaper part firstand see if it fixes things. Just two days ago I had the fan relay go bad which overheated the engine and trans. The relay was fixable, since when I opened it up I discovered the solder joints had seperated
Thanks in advance!
Last edited by FireDemonSiC; 10-21-2009 at 09:29 AM.
i kinda hvae the same problem but mines a 89 firebird 305 tbi but i never got the codes till one day i shut the car off and never sae them again could that mean i have a bad relay too
?????
Viprklr, mine is an 85. It was to my understanding there were two relays. The burnoff, which is decent sized box on the ecm, and the power relay which people say is in the relay cluster on the firewall. But in this 'cluster' on my car, there is only one relay and I thought it went to the fuel pump. So where is the maf power relay located?
Hey man, on these cars , the fuel injectors will almost always make your car act this way. They are notorious for going bad on tpi cars. They will not trigger a code either when they do go bad. I had a problem a few weeks ago with my 350 tpi. I would get to a stoplight and it would just die on me. Also horsepower was down and there was a lot of hesitation. Car just ran like complete ****. Well , i did have a code 45 also. Turns out , my 02 sensor was loose and I had a bad injector. Get a multimeter and set it to ohms and to 2K. Then pull the connector off of each injector with the engine off, and key on. Then just test each injector.Your ohms should be around 0.013 to 0.020. Anything like 0.003 or 0.010 is bad. They should all be pretty close to each other. As for your codes, I beleive you are on the right track with that. I would def. rule out fuel injectors first though. http://www.thirdgen.org/injectorswap
Viprklr, mine is an 85. It was to my understanding there were two relays. The burnoff, which is decent sized box on the ecm, and the power relay which people say is in the relay cluster on the firewall. But in this 'cluster' on my car, there is only one relay and I thought it went to the fuel pump. So where is the maf power relay located?
On the '85s the MAF power relay is in the burn off module. On the module pin D (blue) is the burn off signal to the MAF. With pin F (PPL) as the +12 volts to the MAF.
Hey FireDemonSiC did you ever figure it out. I have an 85 with same problems, just wondering if you fixed it and what it was? Thanks
Yes. The hard start was, are you sitting down? The 3 amp fuse for the cold start injector circuit was blown...
All the other problems were caused by a bad MAF sensor. Other than my EGR going problematic for a week, I haven't had a check engine light since I replaced it in december.
