85 El Camino with major drivability issues

T

Thediggsmang

Not-quite-so-new-guy
Jul 22, 2019
16
3
This might be kind of long so bare with me. First I have an 85 El Camino with a 305 (not sure if it's the original) I bought it with an aftermarket Edlebrock intake manifold,Holley 750 carb, flow master exhaust with CC delete. I began having an issue with her about a month ago. She ran great and then one day she didn't. She had a tendency to deisel out and when you needed to make a quick get away she would fall flat on her face. But other than that no issues. I have had to replace the starter, alternator. Stupid stuff. Well I ended up running off the road and I blew out a tire. That's all I thought was the issue. Then she started to run like crap. The electronics were cutting out, rough idle, really rough and rough running. So I went to buy a Quadrajet. I put the Quadrajet on and I eventually got it to run but she revs up. The electronics problem was the starter main post was broken. And the rough running I believe was 2 busted spark plugs. The issue is the carb had been messed with so now it's all out of whack. Now I'm pretty sure I have it all dialed in but now she backfires when accelerating, if I try to speed off then she does well until I level the acceleration out then she backfires. I can run her in second up to 50mph and have no issues other then a rough idle. I mean rough. I have no idea what my problem is. I have a new timing chain, I'm going to clean out the carb today, I also have a new complete gasket set for her that I'm thinking about putting on while I'm doing all of this and I hope to get a compression gauge in the next day or 2. I don't know how to use one. But I'll learn. Is there annything I might be missing or any tips. Please. Thank you.
 
  • Like
Reactions: Tony1968
T

Thediggsmang

Not-quite-so-new-guy
Jul 22, 2019
16
3
Yeah I know that is way to big of a carb but it's what was on it when I bought it. I do have a Rochester 4 barrel 600 cfm for it but it's missing some rod levers and wants to rev up when I install it. Not to red line but way more then it should. I was thinking timing myself. I have a brand new double chain timing chain and gears ready to go. I am waiting on my compression tester and I also noticed today that I have a major major exhaust leak. Think I will fix that first then timing and while I'm doing the timing might do new valve cover gaskets. I have an entire gasket set for my truck. I just want to know I'm on the right path. If this was a motorcycle I could have it diagnosed and fixed before you even finished telling me the problem. I don't know crap about motorcycles. The solution just comes to me. I don't know crap about cars but so far it seems I second guess myself because it is my dream car and I don't want to mess it up but other advise tends too lead me down blind alleys. I will say that it's nice to have others who validate my original thinking. El Camino central was a bunch of who ha. Blind alley after blind alley. Took me almost a month for someone to mention the starter could be the electronic problem. That's what I thought. But was told no since I just replaced it. Thank you all for your help. I'm sure I will have alot more questions so I'll keep this post up to date daily if possible.
 
roger1

roger1

Master Mechanic
Aug 23, 2010
472
93
San Angelo, TX
Take your valve covers off and have someone crank the engine. Make sure all the rocker arms are moving. You might have flattened lobes for one of the cylinders.
 
R

RabbitHoleSS

Greasemonkey
Dec 8, 2019
243
93
Indianapolis
Vacuum gauge, compression test, timing light and the suggestions above are your friends.
It sounds like timing or some ignition related problem. Do you drive it short distances often? Were your plugs carbon fouled? Try to run some 93 octane thru it. The vacuum gauge is cheap and can tell you alot about your engine. Also im pretty sure you have a squarebore intake and quads use a spreadbore intake.
 
Thread starter Similar threads Forum Replies Date
TURNA Monte / Camino Cluster G-Body Parts For Sale / Trade 0
bazthespazz Rear window for 1984 El Camino Wanted 0
kornball426 New to me El Camino General Discussion 12
G 85 Camino Chevrolet El Camino / GMC Caballero 8
80elky911 El camino roll bar rear bars inside car Frame / Chassis / Suspension / Steering 13
Macguyver El Camino Frame General Discussion 1
roger1 Looking for an original jack for my El Camino Chevrolet El Camino / GMC Caballero 3
roger1 '87 Choo Choo Customs El Camino on BaT. Looks all original to me General Discussion 4
ThunderBolt979 82-87 El Camino Caballero Facia Differences? General Discussion 1
T Having Issues with 85 El camino General Discussion 16
J 84 el camino lq4 swap dbw question G-Body LS Swap 7
442kid 1980's MONTE CARLO SS MALIBU EL CAMINO 200R4 SHIFTER CABLE & LINKAGE G-Body Parts For Sale / Trade 6
G 85 Camino radiator G-Body LS Swap 2
gnvair Does anyone have a picture of the stock radio brackets for a 86-88 Monte Carlo (or El Camino) Chevrolet Monte Carlo / SS / Malibu 7
Dave_logan14 81 El Camino rear window (tinted) G-Body Parts For Sale / Trade 5
S Looking for passenger side front wheel well molding w/2 tone paint for my 85 El Camino Body / Trim / Paint / Glass 0
8 SOLD EL Camino rear bumper local pickup only G-Body Parts For Sale / Trade 0
A El Camino air conditioning condenser G-Body Parts For Sale / Trade 0
Carlos Garcia Back in action. Body / Trim / Paint / Glass 12
E FOR SALE '84 El Camino Lakeland, FL - $5400 obo G-Body Cars for Sale / Trade 0
T 85 El Camino basic to fill gauge change over General Discussion 2
C Searching for a couple interior pieces El Camino G-Body Parts For Sale / Trade 0
GP403 GBOTM VOTING - March - El Camino G-Body of the Month 18
GP403 GBOTM Entries - March 2020 - El Camino G-Body of the Month 25
x75 El Camino Rear Glass Windshield Rattle Body / Trim / Paint / Glass 6
J trying to get help with a 1985 el camino that the windshield wipers wont turn off General Discussion 2
A Torque Thrust size for rear 80 El Camino Wheels / Tires / Brakes 2
4 EL CAMINO 350/290 swap from 305 Fuel / Air / Boost / Emissions 0
bawazir 84 el Camino LS3 swap Restoration 1
blk7gxn 80 El Camino FOR SALE not mine- link below for your entertainment General Discussion 0
A 1980 El Camino heater duct Cooling / Heating / AC 0
A '80 El Camino, '88 Camaro 350 TPI headpipe recommendation Exhaust 4
B 1983 El Camino SS Choo Choo nose? Chevrolet El Camino / GMC Caballero 3
A El Camino gas tank retro-fit with Roadmaster Wagon fuel tank Chevrolet El Camino / GMC Caballero 10
M 2000 SS Camaro wheels on My El Camino? Wheels / Tires / Brakes 9
TURNA Another "custom" Camino General Discussion 13
8 El camino bumpers Chevrolet El Camino / GMC Caballero 2
tc1959 The 83 Chevy El Camino. General Discussion 0
tc1959 *ss Monkey selling a Green 79 El Camino General Discussion 22
roger1 '85 Choo Choo SS El Camino on BaT Chevrolet El Camino / GMC Caballero 0
gnvair Anyone see the wrecked Royal Knight 4 speed El Camino on Facebook? General Discussion 21
M New to the forum, just bought my first car an 83 El Camino (Also looking for some help with doorlocks) New Users 5
MCCAY EL CAMINO Wife's dream car is an El Camino, now she has one. New Users 3
jlcustomz Another 2010 camaro nose el camino Photos, Videos, etc. 2
Z 1984 el camino, NEED HELP PLEASE! Chevrolet El Camino / GMC Caballero 15
G Finding Front-Axle Center line Frame / Chassis / Suspension / Steering 15
A LS3 drysump engine in El Camino 87 ? G-Body LS Swap 8
A New El Camino from Germany New Users 25
E Column shifter issue 85 el camino Transmission / Rear End / Driveline 0
80elky 80 el camino bumpers Body / Trim / Paint / Glass 0
Similar threads


















































Please support GBodyForum Sponsors

Classic Truck ConsolesDixie Restoration DepotMike's MontesP-S-TSouthside Machine PerformanceUMI Performance

contact[email protected]for info on becoming a sponsor