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Old 10-23-2002, 02:14 PM
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Post hot side, 350 tpi engine runs hot on one bank?

hi all, i have a 1985 tpi engine in a viper kit car based on the 85 corvette, the engine has been rebuilt with dart 2 heads and higher comp with a cam. The fuel injection is standard injectors and intake with an ecu which is made by an english company called 'Omex' which has to be mapped on a rolling road. The problem is that the right hand bank runs hot to start with and it dose not fire on all cylinders when cold. any ideas what would cause the engine to miss fire when cold? ellis@chalkfarmtyres.co.uk

[ October 23, 2002: Message edited by: Ellisb ]</p>

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Old 10-23-2002, 07:04 PM
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Sounds like a fuel distribuion problem. How do you know that one bank is running hotter than the other? how much hotter?
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Old 10-23-2002, 11:36 PM
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when it was running at fast idle, the right hand bank the headers were glowing red hot and the left seemed cold by comparison.
i thought it might be the ecu but am unshure and want somebodys opinion before i return it with the complaint.
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Old 10-24-2002, 12:01 AM
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Your headers may present a slighty higher restriction at idle, the only way to tell is with an EGT probe anyway. What do your plugs look like? Does the engine preignite (detonate)? Any hesitation? How does it run?
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Old 10-24-2002, 01:48 AM
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i havent given the full story because i dident want to start anyone thinking in any one direction but the ecu has only been partly mapped and i have to take the car to the rolling road next week but wanted to make sure that there was not any basic problems wrong with the engine, ignition ect before i have the mapping done as this would effect the whole job. The people who do the mapping are very good at engine management but they do not seem to know the basic engine and what is normal as far as temprature is concerned.
the plugs are sooty and it looks like there running rich but the car runs lean on idle.
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Old 10-24-2002, 10:37 AM
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If someone were to re-map the computer, than it would seem to me that one would not be able to do a very good job of setting it up without knowing the in and outs of a internal combustion engine! If your not 110$ confident about thier abililty than please take elswhere. I'm sure the re-maping will fix your concerns. However It's nearly impossible to find a problem when other problems exist that affect the system at fault. Ask thier opinion first than post us.
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Old 10-24-2002, 02:27 PM
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john do you realy think that the mapping will effect one bank? the injectors are fired in banks and the mapping effects both side the same so why would it matter? if the whole thing ran hot i would say yes the thing is running lean, but one side? have you much experiance with the tpi? i am just learning about fuel injection now with this project and have built many a small block road and race engines with carb and never had this amount of greif, is it all worth it? <img src="graemlins/pain.gif" border="0" alt="[pain]" />
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Old 10-24-2002, 09:27 PM
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Hey ellis, let em re-read the service manual for the TPI and I'll have a better explaination tomorrow, Its been awhile since I messed with these.
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Old 10-25-2002, 07:28 PM
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TPI fuel injection is really just fast talk for multi-port injection so you have to treat them the same. Injectors are not batch fired to prevent fuel puddling on top the intake valve that happens to be closed. Is it possible that the headers are thinner on one side causing temps to redden the primary tubes?. How certain are you that the builder hasn't tighted the suspecting banks valves too tight and thier hanging open slightly allowing the increase in exhaust temps through fire leaks?. Listen to 4 jaw. I think he's probably correct that it's really impossible to know exhaust temps with the naked eye. Your shop should notify you of any mechanical problems before re-mapping for this is'nt a quick task. They should even have the temp probes hooked up beforere flashing the computer because they need to know exactly whats going on before they can change anything. Good luck!
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Old 10-26-2002, 07:32 AM
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thanks again for the reply john but they are batch fired, right,left ect, because they are wired up in parralle sets of four. you might be right about the exhauste looking hotter but the right bank realy did feel a lot hotter.
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Old 10-26-2002, 11:49 AM
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Yeah, youre right about batch firing, I miss read the info. Hope you get this problem resolve easly
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Old 10-26-2002, 02:40 PM
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come on you rodders out there who knows lots about fuel injection and may be able to shed some more light on the situation, <img src="confused.gif" border="0">
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Old 10-26-2002, 04:02 PM
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Hello everybody, I just registered today and been surfing around when I read this thread. Nobody has said anything about an air leak in the intake system. Which would explain why it misfires when cold. I could be wrong but carberation or injection would suffer with an air leak on one bank. With the motor running at idle, carefully spray a little starting fluid on the suspect side and if it picks up on the rpm's, there is your problem.
My 2 cents worth Good luck
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Old 10-26-2002, 04:31 PM
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I am going to go with johnsongrass1 on the valves being to tight. I once was asked to look at a smallblock ford and I swear you could almost see through the header. It was only on one side. Later, Jay
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Old 10-26-2002, 11:54 PM
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I am also new to this board and I have to agree with "38 ford 4 door". Something is causing that bank to run lean.

I few things to think about and try.

As "38 ford 4 door" suggested, try a little carb cleaner around the intake. Better yet if you have a small bottle of propane with a valve and a hose that works too and much safer.

Fuel restriction to that bank. Pinched hose, etc.

If it has dual O2 sensors, that side's O2 could be bad.

Fuel pressure regulator could be another cause. Try pinching off the return line to the tank and see if that helps.

Good Luck!
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