having issues with my L98
Thread Starter
Teching In
Joined: Sep 2008
Posts: 14
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having issues with my L98 if anyone has any insight i would appreciate it.
i put an l98 tpi 350 from an 89 vette in my landcruiser. it has been acting up lately. last week on the trail it was stalling out, acting up, and would not start until i let it cool down. it seemed to run very normal when cool. it was idling very rough and would die if i gave it throttle. anyway had it scanned and the o3 sensor was bad. changed that. idles better, but eventually it loads up and then acts as if it is running in 7 cylinders, and the exhaust/cats seem to be way hotter than they should be. BTW i pulled the cats and they are clean and not plugged. also, not throwing any codes...
gonna compression test tomorrow
any ideas? much appreciated
i put an l98 tpi 350 from an 89 vette in my landcruiser. it has been acting up lately. last week on the trail it was stalling out, acting up, and would not start until i let it cool down. it seemed to run very normal when cool. it was idling very rough and would die if i gave it throttle. anyway had it scanned and the o3 sensor was bad. changed that. idles better, but eventually it loads up and then acts as if it is running in 7 cylinders, and the exhaust/cats seem to be way hotter than they should be. BTW i pulled the cats and they are clean and not plugged. also, not throwing any codes...
gonna compression test tomorrow
any ideas? much appreciated
Last edited by VETTE60; Sep 5, 2008 at 09:01 PM. Reason: added
Engine problems can happen no matter what intake is on top.
Check the injectors to make sure they're good. One simple method is to ohm test them all when they're cold, and again when they're hot. Pull the clip off one and put the test leads on the tangs of the injector. Anything less than 12 ohms and its definitely bad.
Check the injectors to make sure they're good. One simple method is to ohm test them all when they're cold, and again when they're hot. Pull the clip off one and put the test leads on the tangs of the injector. Anything less than 12 ohms and its definitely bad.
Thread Starter
Teching In
Joined: Sep 2008
Posts: 14
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Engine problems can happen no matter what intake is on top.
Check the injectors to make sure they're good. One simple method is to ohm test them all when they're cold, and again when they're hot. Pull the clip off one and put the test leads on the tangs of the injector. Anything less than 12 ohms and its definitely bad.
Check the injectors to make sure they're good. One simple method is to ohm test them all when they're cold, and again when they're hot. Pull the clip off one and put the test leads on the tangs of the injector. Anything less than 12 ohms and its definitely bad.
Thread Starter
Teching In
Joined: Sep 2008
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yes....I know this full well...but i do not have a carb! i have a tpi...
and i live in california and can't put a carb on it...
sooo.... anyway i will check the injectors and get back
but i think that it may be something else. usually a very hot cat is either clogged or getting unburned fuel into it so i think it is either an ignition fault or a dead hole...
i appreciate the input.
and i live in california and can't put a carb on it...
sooo.... anyway i will check the injectors and get back
but i think that it may be something else. usually a very hot cat is either clogged or getting unburned fuel into it so i think it is either an ignition fault or a dead hole...
i appreciate the input.
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Teching In
Joined: Sep 2008
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yes, and then a second post about a carb. and someone else chiming in also. once again, i am looking for help with a tpi. you telling me that a carb is easier is not helping.
i am not looking to offend, this is not a pissing match, i am just looking for help with a problem i have, nothing more. and not interested in hearing how a carb is easier. i know that. like i said those comments are better left for the chit chat threads. thanks
i am not looking to offend, this is not a pissing match, i am just looking for help with a problem i have, nothing more. and not interested in hearing how a carb is easier. i know that. like i said those comments are better left for the chit chat threads. thanks
TECH Enthusiast
Joined: Dec 2005
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VETTE60 dude chill out man ok did you check the timing?fuel pressure?when was the last time you changed the spark plugs? check the injectors like Kevin91Z said and then check the sensors in the throttle bodie I used to have a problem in my 92 Z28 when I give it a throttle it dies the IAC sensor was dirty so check all the sensors and reply to us what happen after that and sorry about the off topic that happend earlier
On The Tree
Joined: Mar 2005
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From: From NJ, in WV for school
First thing I would do (since it's a OHV and thus easier) is pull the spark plugs out and look at them. If they're black, replace. If they look good, look at other things (white is also bad).
Spark plugs are usually the first sign of trouble for me, and the first thing I check on anything other than my diesel (which has none).
Spark plugs are usually the first sign of trouble for me, and the first thing I check on anything other than my diesel (which has none).
Uhm, how so? It really depends on what you're used to. I can open the hood on a carb'd car, stare at it for a few minutes, and not have a clue how to fix it.
But I can plug my scan tool into an EFI car, read what the computer is seeing, and diagnose the problem fairly quickly. I'm sure you'd be as lost with an EFI car as I would be on a carb car. The extra sensors on an EFI car might seem more complex, but they really do aid in troubleshooting and providing feedback. There is no feedback on a carb car, other than "its not running right."
But I can plug my scan tool into an EFI car, read what the computer is seeing, and diagnose the problem fairly quickly. I'm sure you'd be as lost with an EFI car as I would be on a carb car. The extra sensors on an EFI car might seem more complex, but they really do aid in troubleshooting and providing feedback. There is no feedback on a carb car, other than "its not running right."
Thread Starter
Teching In
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okay...did the cap/rotor/plugs/wires all new. checked the injector resistance. there were a few between 6.8-9 ohms, other injectors were at 16 ohms. i guess i could throw in a new set of injectors. seems like it is running rich though, and my ehuaust feels much hotter than it should be around the cats, which makes me think i am getting a lot of unburned fuel ito the cats which is than lighting off and getting them very hot....btw did a compression check and all holes were at 145 psi. also my oil pressur just started reading very high, but6 i am guessing a new sending unit will probably remedy that. any other ideas. thanks for the help so far.
Last edited by VETTE60; Sep 14, 2008 at 12:32 AM.
You should probably replace all 8 to be on the safe side.
I agree completely, 6 ohm's and theyre nicely cooked haha!
Multecs are quite unreliable.
I can do a stock replacement set of our rebuilt Bosch Design III's, 22lb for $169.95 + $11.60 shipping to your door. They come flow matched, with Viton o-rings installed, and a 3 year warranty.
For the L98 I also have the complete gasket set, including the rail o-rings for an additional $30, no extra shipping. That way you can get everything you need to get those multec's out for no extra charge.
PM me if your interested, and check out our reviews on Corvetteforum if you like
~Rich
Multecs are quite unreliable.
I can do a stock replacement set of our rebuilt Bosch Design III's, 22lb for $169.95 + $11.60 shipping to your door. They come flow matched, with Viton o-rings installed, and a 3 year warranty.
For the L98 I also have the complete gasket set, including the rail o-rings for an additional $30, no extra shipping. That way you can get everything you need to get those multec's out for no extra charge.
PM me if your interested, and check out our reviews on Corvetteforum if you like
~Rich
Thread Starter
Teching In
Joined: Sep 2008
Posts: 14
Likes: 0
I agree completely, 6 ohm's and theyre nicely cooked haha!
Multecs are quite unreliable.
I can do a stock replacement set of our rebuilt Bosch Design III's, 22lb for $169.95 + $11.60 shipping to your door. They come flow matched, with Viton o-rings installed, and a 3 year warranty.
For the L98 I also have the complete gasket set, including the rail o-rings for an additional $30, no extra shipping. That way you can get everything you need to get those multec's out for no extra charge.
PM me if your interested, and check out our reviews on Corvetteforum if you like
~Rich
Multecs are quite unreliable.
I can do a stock replacement set of our rebuilt Bosch Design III's, 22lb for $169.95 + $11.60 shipping to your door. They come flow matched, with Viton o-rings installed, and a 3 year warranty.
For the L98 I also have the complete gasket set, including the rail o-rings for an additional $30, no extra shipping. That way you can get everything you need to get those multec's out for no extra charge.
PM me if your interested, and check out our reviews on Corvetteforum if you like
~Rich