View Full Version : 98 LS1s?


LSWaaa?
10-18-2006, 08:20 PM
im lookin into buying a LS1 Z28 but its a '98. ive been told to stay away from '98s because of certain failures. anybody know what goes wrong with 98 LS1s or 98 Fbodys in general? does it just apply for only 98 model year cars or after?

TheAntiRice
10-18-2006, 08:29 PM
my ls1 had no issues i replaced my tstat at 150k

NxLS1496
10-18-2006, 08:32 PM
I have a 98 a4 with 75k miles on it. runs like a brand new car. no lie. The automatic tranny is still very very strong, will bark second gear sometimes and just glides. no overheating, no sagging shocks(yet), no broken window motors, no a/c problems, nothing. i love my car. the pervious owner was a younger guy but took very nice care of everything and before that it was ownder by an old lady. i might be lucky though, this is just my experience.

LS1T/A4
10-18-2006, 09:41 PM
I have a 98 Auto w/61xxx miles, runs perfect. Replaced alternator at 60k, recharged a/c at 58k. Alot of it is internet talk, an LS1 fbody is an LS1 fbody.

jfman
10-18-2006, 10:24 PM
The "problems" people refer to when they are talking about the 98 are the computer system that is different from other years is all.

1998SuperSportCAMARO
10-19-2006, 12:35 PM
i know that the 97-99 LS1 has a oil pump problem where it can drop all pressure and wipe out the motor. 98's have less hp/tq then other years cuz of intake and head design.

98redM6
10-19-2006, 03:13 PM
All I can remember is that there was a recall on some 98s for cylinder head problems or something regarding the engine internals. Mine was one of those cars but i didn't have to deal with it, the original owner did.

Other than that, in stock or modded form they should hold up just as well as newer f-bodys. There have been some upgrades in certain parts (t-stat, computer, tb, heads, intake, etc.) These are upgrades that were due to advancement not to complaints from owners. If I had a choice between a 98 and a newer car of course I would pick the newer car, given that it is the same condition. If you come across a nicely modded 98 for a decent price don't shy away from it.

LSWaaa?
10-19-2006, 11:22 PM
i heard that the bottom ends are weak, piston slaps, oil pumps go bad, and some other odds and ends. pretty tall list just right there if you ask me.

KHShapiro
10-19-2006, 11:50 PM
98's have a harder time in the tuning department due to analog signal
98 blocks have a thinner sleeves and a pass thru vent between the cyls. this doesnt mean the block is weaker it just means if something happenen you might have to buy a new block or have it resleeved and have the vent cut in by a company like RACE ENGINE DEVELOPEMENT
97-98 heads are slightly different, valve cover bolts
98's have 28 lbs injectors 99-00 went to 26 then back to 28 in 01-02
98 have a working temp gauge unlike the other years which are dummy gauges
The piston slap issue plagued all ls1's until the pcv system was redesigned and the ls6 pcv system was used. It is commom practice now if you havent updated to the ls6 pcv system is to add a catch can inbetween the VC and the TB to catch the access oil before entering the intake causing the knocking sound on start up.
99-00 have the oil pumps issues
all of this can be researched here using the search feature

KHShapiro
10-19-2006, 11:58 PM
oh and as far as the tunning its not that it cant be done with ls1edit or HPtuners, it is just if you went FI that it becomes harder beacuse you reach the limit of the pcm quicker than the 99+ pcm's

98's are a great choice esp if the price is right

LSWaaa?
10-20-2006, 11:49 AM
can guys with '98s give me an assessment of what they have changed? bolt on cars and ones that have been heavily modded.

LSWaaa?
10-22-2006, 05:17 PM
ttt???

KHShapiro
10-22-2006, 05:19 PM
reread my post and maybe use the search feature

LS1T/A4
10-22-2006, 06:14 PM
I have added a SLP lid, B&M Trans Cooler and a Hooker Catback system. My particular LS1 has no piston slap and the valvtrain is fairly quiet with the normal rocker "tick". I spin it up to ~6000rpm atleast twice a week and it has been down the track 10 times.

LSWaaa?
10-24-2006, 08:03 AM
reread my post and maybe use the search feature
i did and the search is too broad a subject, just looking for more peoples opinion.

~RedLineLs1~
10-25-2006, 12:27 AM
I have over 100,000 miles on my car and the only major thing that went wrong was trashing the transmission when the car was stock, which has no relation to being a 98...the 4l60e is just a weak tranny. Ive never had a problem with piston slap, never burn oil, oil pressure is awesome, etc. The only things that have went bad were the window motors, headlight gears, etc which is also very common on any ls1. Since the tranny gave out I have added everything in my sig. If I wasn't confident in my 98, I sure as hell wouldn't be spraying with 100k miles on the engine.

The major downfall to the 98s is the PCM. It becomes difficult to tune once certain power levels are reached, usually related to forced induction. Its not impossible though.

s1ck s0n
10-25-2006, 06:59 AM
i have a 98 z28 with 88k on it and it still runs like a champ, i drive it everyday, and not very nicely all time lol. it pulls on my friends 02 ws6, and went 8.3 @88 with just a lid in the 1/8.

WhiteKnightZ28
10-26-2006, 08:44 PM
No problem makeing over 400rwhp here... :devil:

RPM WS6
10-26-2006, 08:52 PM
Potential oil pump issues were from '98 to '00. They all had the same pump till the '01+ cars. Anyway, oil pump failures are very rare and nothing that should keep you away from the '98-'00 cars.

My '98 burns no oil.

My '98 has no piston slap.

I have only a small amount of the normal LS1 valvetrain noise (sewing machine) that all these cars have. My '99 and my '00 had the same thing.

People telling you that '98s are bad is just from plain ignorance.

TA Dave
10-26-2006, 09:38 PM
My 98 TA made 351/362 with headers, LS6 intake, but stock internals... I sold it 2 months ago and it was running 100%.

My 98 SS is a lid only car and there are no issues with it at all.

I have no problems owning a 98, and I'd buy another if the price was right. ;)

Rob98LS1
10-29-2006, 01:09 AM
158k miles here and runs like new... my window motors are a little slow, but that sure as hell beats a blown motor!

s1ck s0n
10-29-2006, 09:32 AM
yeah, my windows are slow as fuck, i think thats my only complaint.

'Trust'
10-29-2006, 02:18 PM
i heard that the bottom ends are weak, piston slaps, oil pumps go bad, and some other odds and ends. pretty tall list just right there if you ask me.

Weaker bottom ends? No, weaker rodbolts yes, and they only come into play when you spin the motor higher than 6500. There are people running 9's on the stock bottom end on 98's.
Oil Pumps go bad: 98-00 issue, only occured during very low milage 0-10k, if it didn't fail by then its not going to under normal conditions. If you do a cam and not an oil pump for cheap insurance and it fails, thats your fault.
Piston Slap: Nope, never heard of even 1 98 that has had piston slap, it seems that started in late 00.

RPM WS6
10-29-2006, 05:29 PM
Piston Slap: Nope, never heard of even 1 98 that has had piston slap

You're right. It seems that '98s are the least likely to have piston slap. Also, of the 3 LS1s I've owned ('98, '99, and '00) the '98 is the only one that doesn't seem to use a drop of oil. ;)

Stang-Slayer
10-29-2006, 08:41 PM
I had a 98 with 86000 miles on it....not a single major issue!

It just so happens 98's seem to be pretty big freaks compaired to the other years.....diffent cam sizes and lsas and all

quadd224422
10-29-2006, 08:56 PM
Hey guys some of you may already know this site but check it out anyways.It tells all the different things gm changed with the 98-02 ls1 motors its a pretty good site I think
here it is http://www.lastofthebreed.com/ServiceInformation/FbodyDiff.htm
quad

1998SuperSportCAMARO
10-30-2006, 05:07 PM
i heard that the bottom ends are weak, piston slaps, oil pumps go bad, and some other odds and ends. pretty tall list just right there if you ask me.



never heard of the weaker bottom ends??? dont know where u got ur info but its wrong. forged crank and billet powder coated pistons and rods like all the rest.

KHShapiro
10-30-2006, 08:23 PM
Hey guys some of you may already know this site but check it out anyways.It tells all the different things gm changed with the 98-02 ls1 motors its a pretty good site I think
here it is http://www.lastofthebreed.com/ServiceInformation/FbodyDiff.htm
quad
its an almost complete list , they did not mention the facts, yes facts i mentioned in my post.. hooray for me!

white mongoose
11-01-2006, 12:25 AM
i have a 98 ss 40xxx miles nitrous cam,full bolts on,tires, and rear end on the way my car been running like a champ i ran a 13.00 flat on street tires when i was practicly stock only intake i been gooing up agaisnt alot off the newer f bodys cause they said they were faster thats bull shit i have seen a couple off stock 98 run 12.9,12.8 so i think there perfectly fine and they only made 28xx ss so if u come up on one off them that will b nice mines #349

Thule
11-06-2006, 08:31 AM
i hafe a 98 m6 car, driven 32789 and my motor is gone, out of nowhere died when i was cruizing, how dues this piston slap sound slike? my motor knock's like hell, i think it is a crankshaft bearing

MJK
11-07-2006, 01:58 AM
I bought a 98' TA brand new in 04/17/98.Ran her up to 93K miles before we sold her and the issues were the AC compressor went out at 60K miles,power window motor and one of the little winshield squirter things went out on me...

Never used up oil,never had tranny probs (A4) and never had the dreaded piston slap noises..

98's are great cars and I would NOT hesitate to buy one again if I was in the market.I drive a 00' now only because I ran across it in great condition and it was in my price range...plus I dig the ebony interior over the grey...;)

Thule
11-07-2006, 11:32 AM
i took my car to a workshop this morning, there was another one, 00SS with the most piston slap i hafe ever heard, my freinds 00 ws6 knocks like hell when its cold,

after i bougth my 98, i think that the ls1 motor is CRAP
but its one of the most fun motor i hafe ever come a cross though..

how is the ls6 motor? any known problems?

RPM WS6
11-07-2006, 12:05 PM
after i bougth my 98, i think that the ls1 motor is CRAP

You'll find that thousands and thousands of people on here will disagree with you. A little piston slap when cold doesn't make the motor junk, plenty of motors will do that for 100,000+ miles and be just fine. :)

Thule
11-07-2006, 12:38 PM
im just angry because mine is death with so few miles =(

no there is alot of thes cars here and.. i to many of them haf had serius engine failures..

but i still love the LS cars.. and will fix mine

Street Lethal
11-08-2006, 01:46 PM
the issues were the AC compressor went out at 60K miles, power window motor and one of the little winshield squirter things went out on me...

My A/C compressor went out on me around the same time. Passenger side motor is a little slow (in comparison to the drivers side, of course). That infamous headlight noise due to stripped plastic gears, as well as lower (but still adequate) than normal oil pressure.

... and, of course, that horrible Monsoon radio (which all of us were subjected to). :jest:

Other than that, I wouldn't trade her in for anything. I've since replaced those pathetic plastic gears, installed a much better oil pump (when the cam went in), and will deal with the passenger side window motor when it finally gives out...

With just a lid, K&N (w/FRA), and a stall... ran a mid twelve second pass @ the track. Yeah, I was very impressed, being that everything else was stock, including it's tune. ;)

LSWaaa?
11-08-2006, 06:34 PM
Weaker bottom ends? No, weaker rodbolts yes, and they only come into play when you spin the motor higher than 6500. There are people running 9's on the stock bottom end on 98's.
Oil Pumps go bad: 98-00 issue, only occured during very low milage 0-10k, if it didn't fail by then its not going to under normal conditions. If you do a cam and not an oil pump for cheap insurance and it fails, thats your fault.
Piston Slap: Nope, never heard of even 1 98 that has had piston slap, it seems that started in late 00.
lets say i do get a 98 LS1, could i put in ARP bolts in the stock bottom end and it will hold up?

LSWaaa?
11-08-2006, 06:34 PM
Hey guys some of you may already know this site but check it out anyways.It tells all the different things gm changed with the 98-02 ls1 motors its a pretty good site I think
here it is http://www.lastofthebreed.com/ServiceInformation/FbodyDiff.htm
quad
great link!

LS1W66
11-08-2006, 06:59 PM
112K still on the original clutch replaced A/C Compressor, Headlight motor, Fuel level sending unit all under warranty by 50k.
Since then I've replaced the waterpump, drivers window motor, Motor & Trans mounts, and bent pushrods from a missed shift.
She does use some oil but no more than a quart between oil changes.
This Car is my daily driver and has 20+ track passes and 300 or so street runs on it. So she is not really babied.
She Dynoed 300 RWHP and 322 RWTQ on a Dynapack with 109K miles this past sping.

'Trust'
11-08-2006, 07:06 PM
The A/C compressor issue mentioned was due to the 98 programming, nothing to do with the mechanics of the engine, same thing would happen if the WOT shut off was set the same on an 02 LS1. It can be fixed with a touch on the tune.

lets say i do get a 98 LS1, could i put in ARP bolts in the stock bottom end and it will hold up?

Absolutely. People run 9's on the stock bottom ends on these motors with rod bolts.

ngozer
11-08-2006, 07:41 PM
mine has 86 and change on it, no piston slap but uses oil mostly on long trips. dont know wats up with that but im guessing its the pcv. i think i may have a bad o2 sensor now but i havent had any serious issues and still love it, great engines!!
:judge:

NHRAMAN
11-08-2006, 07:44 PM
I have a 98 Auto w/61xxx miles, runs perfect. Replaced alternator at 60k, recharged a/c at 58k. Alot of it is internet talk, an LS1 fbody is an LS1 fbody.
NO..the computers are different in the 98's.

Rob98LS1
11-12-2006, 06:54 AM
yep the computers are different, heard that they are harder to tune with once you reach up around 450-500 rwhp

'Trust'
11-12-2006, 01:59 PM
They are a lil harder to tune, but mostly with FI as they are missing a table that the 99+'s have. However tuning NA with a large H/C can be a challenge, but so it can for any year, nature of the beast I suppose.

KillA98Z
11-13-2006, 07:17 PM
i bought a 98 z with a blown motor because of a bad oil pump